Nabble - Gnu - PSPP

Re: Consortium to update PSPP?

2009-12-13T15:17:41Z

On Sat, Dec 12, 2009 at 11:54:15AM -0600, Patrick Welch wrote:
> So long as the developers agree with such an effort I would gladly
> donate to such an effort.

It sounds good to me. Now I'm wondering about the details.

>
> Pat
>
> On 09-12-11 12:46 PM, Galderisi, Peter wrote:
>> Greetings,
>>
>> I have been using PSPP from Ben Plaff and others this quarter in my class as a
>> successful substitute for SPSS (or, I guess now, PASW). Ben, Jim
>> and the gang are busy trying to update the software. I am
>> suggested setting up a consortium to accept donations to hire
>> someone to help with the updates (graphics, output, extra statistics, etc.) etc. We can set up a priority list based
>> on donors given first request.
>> The donations will be set up through the Software Freedom Conservancy, not me. I will pledge to match the first $300 that will be obligated.
>> Let me know if there are enough non free-riders out there.
>> I think that, with a few thousand dollars, a graduate student could be hired to make several of the updates.
>>
>> Thanks so much.
>>
>> Peter
>>
>>
>>
>> _______________________________________________
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>> Pspp-users@...
>> http://lists.gnu.org/mailman/listinfo/pspp-users
>>
>
>
>
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PSPP-output (aka 0.7.3) build for Karmic

2009-12-12T13:08:48Z

Hi,

PSPP-output (aka 0.7.3) build for Karmic:
https://launchpad.net/~gandalf/+archive/pspp-output/+packages

Output window schreenschoot: http://matej.owca.info/PSPP073.png

Looks nice.

bye, Matej

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Re: Consortium to update PSPP?

2009-12-12T09:54:15Z

So long as the developers agree with such an effort I would gladly
donate to such an effort.

Pat

On 09-12-11 12:46 PM, Galderisi, Peter wrote:

> Greetings,
>
> I have been using PSPP from Ben Plaff and others this quarter in my class as a
> successful substitute for SPSS (or, I guess now, PASW). Ben, Jim
> and the gang are busy trying to update the software. I am
> suggested setting up a consortium to accept donations to hire
> someone to help with the updates (graphics, output, extra statistics, etc.) etc. We can set up a priority list based
> on donors given first request.
> The donations will be set up through the Software Freedom Conservancy, not me. I will pledge to match the first $300 that will be obligated.
> Let me know if there are enough non free-riders out there.
> I think that, with a few thousand dollars, a graduate student could be hired to make several of the updates.
>
> Thanks so much.
>
> Peter
>
>
>
> _______________________________________________
> Pspp-users mailing list
> Pspp-users@...
> http://lists.gnu.org/mailman/listinfo/pspp-users
>

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Consortium to update PSPP?

2009-12-11T10:46:36Z

Greetings,

I have been using PSPP from Ben Plaff and others this quarter in my class as a
successful substitute for SPSS (or, I guess now, PASW). Ben, Jim
and the gang are busy trying to update the software. I am
suggested setting up a consortium to accept donations to hire
someone to help with the updates (graphics, output, extra statistics, etc.) etc. We can set up a priority list based
on donors given first request.
The donations will be set up through the Software Freedom Conservancy, not me. I will pledge to match the first $300 that will be obligated.
Let me know if there are enough non free-riders out there.
I think that, with a few thousand dollars, a graduate student could be hired to make several of the updates.

Thanks so much.

Peter

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From forum: Gnu - PSPP - Users

gui chart success

2009-12-10T23:05:01Z

I finally got the output code rewrite to the stage where it can
display charts in the GUI. There is still a lot of work to do
(bug fixes galore), plus a huge amount of cleanup, before
anything becomes suitable to push to savannah, but I thought that
some of the eager folks around here might want to look anyway.

To take a look, grab the "output" branch from
git://benpfaff.org/pspp, e.g. if you are already in a Git
repository locally:

git remote add benpfaff.org git://benpfaff.org/pspp
git fetch benpfaff.org
git checkout benpfaff.org/pspp
--
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Re: afm files

2009-12-07T11:29:49Z

John Darrington <john@...> writes:

> Now that afm.c has been removed from the output branch, is there any
> need to keep the config/psfonts directory ?

No. Thanks for noticing.
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afm files

2009-12-07T10:24:05Z

Now that afm.c has been removed from the output branch, is there any
need to keep the config/psfonts directory ?

J'

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Re: using pspp to access .spo files from pre-SPSS v.18 ?

2009-12-04T08:03:24Z

This is probably what you need.

http://support.spss.com/student/Troubleshooting/stuResSearchDetail.asp?ID=73752

On Thu, Dec 3, 2009 at 11:54 AM, Ben Pfaff <blp@...> wrote:

Rochelle E Tractenberg <ret7@...> writes:

> my institution, like many others, has *some* licensed features of
> spss, but misses many that I need. that wasn't sufficient to drive me
> to open source - but now, we are forced to use SPSS 18 and it
> stipulates that it will not open any .spo file - ie, 13 years' worth
> of using SPSS is now inaccessible to me. I am wholly new to pspp, so
> can anyone tell me if it will open .spo files?

No, PSPP cannot read SPSS output files (though it can read SPSS
data and syntax files).
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Re: plots in gui

2009-12-03T11:26:25Z

On Thu, 03 Dec 2009 09:37:45 -0800
Ben Pfaff <blp@...> wrote:

> Kristoffer Ericson <kristoffer.ericson@...> writes:
>
> > Also, if I can help in any way
> > let me know. Im used to coding kernel stuff so not sure
> > how much I can do (seems to require statistical knowledge foremost).
>
> You could babysit my daughter, I guess. That's probably what I
> need more than anything else :-)

Ah, doh!

> --
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> http://benpfaff.org

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Re: using pspp to access .spo files from pre-SPSS v.18 ? [SOLVED]

2009-12-03T11:04:34Z

there is an SPSS-fix for this problem, a legacy viewer.

http://www.spss.com/media/software/SPSS_Legacy_Viewer_win_en.exe

and this automizer:

"The Legacy viewer installer is not properly associating itself with
.spo files. This problem has been reported to SPSS Development for
remediation in a future release. We apologize for any inconvenience
this has caused. In the meantime, you can manually create the
association within Windows, or, a registry file is available online
which will create this association for you:"

ftp://ftp.spss.com/pub/spss/windows/74989.reg

On Thu, Dec 3, 2009 at 11:54 AM, Ben Pfaff <blp@...> wrote:

> Rochelle E Tractenberg <ret7@...> writes:
>
>> my institution, like many others, has *some* licensed features of
>> spss, but misses many that I need. that wasn't sufficient to drive me
>> to open source - but now, we are forced to use SPSS 18 and it
>> stipulates that it will not open any .spo file - ie, 13 years' worth
>> of using SPSS is now inaccessible to me. I am wholly new to pspp, so
>> can anyone tell me if it will open .spo files?
>
> No, PSPP cannot read SPSS output files (though it can read SPSS
> data and syntax files).
> --
> Ben Pfaff
> http://benpfaff.org
>

--
Rochelle E. Tractenberg, Ph. D., M.P.H.
Director, Collaborative for Research on Outcomes and -Metrics
Neurology
Biostatistics, Bioinformatics & Biomathematics
Psychiatry
Georgetown University Medical Center
291 Building D
4000 Reservoir Road NW
Washington, D.C. 20057
(T) 202.687.2247 (F) 202.784.3504
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Re: PSPP::Perl and utf-8 characters

2009-12-03T10:33:38Z

Are you sure that what you're putting in is valide UTF-8 ? I suspect that it isn't.

I'm attaching a simple test file, based on your test, which writes some UTF-8 labels.
The first label is ascii. The second and third contain european characters, the fourth
contains a couple of chinese characters that I copied from some chinese web site.

Running this perl fragment produces a .sav file which the latest master version reads
perfectly.

J'

On Mon, Nov 30, 2009 at 10:23:32PM -0800, Rob Messer wrote:
Hello,

I am attempting to use PSPP and the PSPP::Perl module to write labels and data that contain non-ASCII characters. Below is a simple test script that includes Chinese characters (encoded as UTF-8) in the value labels. The file is created without errors, but when I open it, either in psppire or SPSS version 18, the labels appear as garbled text. I am using the latest development version 0.7.2. Should this be working correctly? Is anyone else having success writing utf-8 via the PSPP::Perl module? Thanks,

Rob

use PSPP;

my $dict = PSPP::Dict->new ();

my $var1 = PSPP::Var->new ($dict, "Q1", (fmt=>PSPP::Fmt::F, width=>2, decimals=>0) );
$var1->add_value_label (0, q|???????????????|);
$var1->add_value_label (1, q|????????????|);

my $sysfile = PSPP::Sysfile->new ('testfile.sav', $dict);
$sysfile->close();

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Re: plots in gui

2009-12-03T09:37:45Z

Kristoffer Ericson <kristoffer.ericson@...> writes:

> Also, if I can help in any way
> let me know. Im used to coding kernel stuff so not sure
> how much I can do (seems to require statistical knowledge foremost).

You could babysit my daughter, I guess. That's probably what I
need more than anything else :-)
--
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Re: using pspp to access .spo files from pre-SPSS v.18 ?

2009-12-03T08:54:30Z

Rochelle E Tractenberg <ret7@...> writes:

> my institution, like many others, has *some* licensed features of
> spss, but misses many that I need. that wasn't sufficient to drive me
> to open source - but now, we are forced to use SPSS 18 and it
> stipulates that it will not open any .spo file - ie, 13 years' worth
> of using SPSS is now inaccessible to me. I am wholly new to pspp, so
> can anyone tell me if it will open .spo files?

No, PSPP cannot read SPSS output files (though it can read SPSS
data and syntax files).
--
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using pspp to access .spo files from pre-SPSS v.18 ?

2009-12-03T05:01:11Z

my institution, like many others, has *some* licensed features of
spss, but misses many that I need. that wasn't sufficient to drive me
to open source - but now, we are forced to use SPSS 18 and it
stipulates that it will not open any .spo file - ie, 13 years' worth
of using SPSS is now inaccessible to me. I am wholly new to pspp, so
can anyone tell me if it will open .spo files?

--
Rochelle E. Tractenberg, Ph. D., M.P.H.
Director, Collaborative for Research on Outcomes and -Metrics
Neurology
Biostatistics, Bioinformatics & Biomathematics
Psychiatry
Georgetown University Medical Center
291 Building D
4000 Reservoir Road NW
Washington, D.C. 20057
(T) 202.687.2247 (F) 202.784.3504
http://dbbb.georgetown.edu/faculty/secondaryappt/#RochelleNew

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Re: plots in gui

2009-12-02T12:30:16Z

On Mon, 16 Nov 2009 09:23:24 -0800
Ben Pfaff <blp@...> wrote:

> Kristoffer Ericson <kristoffer.ericson@...> writes:
>
> > My school doesnt provide spss in the linux version so I thought I
> > would give pspp a go (or rather discovered pspp due to that fact).
> > First off, from what Ive read the graphical output isnt active in the
> > gui form yet. But Ive also heard that png output works? Is this true
> > and how do I activate it, Im only getting ascii output so far (inside
> > gui).
>
> I am working on graphical output in the GUI (including charts).
> I hope to have something ready for testing by the end of 2009.

Please keep me posted. Also, if I can help in any way
let me know. Im used to coding kernel stuff so not sure
how much I can do (seems to require statistical knowledge foremost).

> --
> Ben Pfaff
> http://benpfaff.org

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Re: Which branch to use for bleeding edge

2009-12-02T12:14:28Z

On Wed, 2 Dec 2009 15:11:55 -0500
Jason Stover <jhs@...> wrote:

> On Wed, Dec 02, 2009 at 06:51:31PM +0100, Kristoffer Ericson wrote:
> > Is the output branch the one that gets the most updates?
>
> Sometimes, but not always.

Oki

>
> > Also, is there anything I could do to speed up the development
> > process (mostly towards graphs)?
>
> Checkout the output branch and try it. Other than changes to output,
> new code is checked in to master or other branches.

Oki will do that Thx.

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Re: Which branch to use for bleeding edge

2009-12-02T12:11:55Z

On Wed, Dec 02, 2009 at 06:51:31PM +0100, Kristoffer Ericson wrote:
> Is the output branch the one that gets the most updates?

Sometimes, but not always.

> Also, is there anything I could do to speed up the development
> process (mostly towards graphs)?

Checkout the output branch and try it. Other than changes to output,
new code is checked in to master or other branches.

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Re: PSPP crashes

2009-12-02T11:16:55Z

Karel Novotny <novotny.karel@...> writes:

> psppire: src/output/manager.c:288: render_segments: Assertion `d->cp_y'
> failed.
> Aborted

For what it's worth, this is a bug in the PSPP output engine,
which I am in the process of completely rewriting, so it should
be fixed in the next release.
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Which branch to use for bleeding edge

2009-12-02T09:51:31Z

Is the output branch the one that gets the most updates?
Also, is there anything I could do to speed up the development
process (mostly towards graphs)?

--
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PSPP crashes

2009-12-02T09:18:22Z

Anyone could help?

I am trying to do crosstabs analysis using PSPPire 0.6.2

Thanks

karel
-------------------------
(psppire:9368): Gtk-WARNING **: Failed to set text from markup due to
error parsing markup: Error on line 1 char 52: ' ' is not a valid
character following a '<' character; it may not begin an element name

(psppire:9368): Gtk-WARNING **: Failed to set text from markup due to
error parsing markup: Error on line 1 char 52: ' ' is not a valid
character following a '<' character; it may not begin an element name

(psppire:9368): Gtk-WARNING **: Failed to set text from markup due to
error parsing markup: Error on line 1 char 52: ' ' is not a valid
character following a '<' character; it may not begin an element name
psppire: src/output/manager.c:288: render_segments: Assertion `d->cp_y'
failed.
Aborted

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PSPP::Perl and utf-8 characters

2009-11-30T22:23:32Z

Hello,

I am attempting to use PSPP and the PSPP::Perl module to write labels and data that contain non-ASCII characters. Below is a simple test script that includes Chinese characters (encoded as UTF-8) in the value labels. The file is created without errors, but when I open it, either in psppire or SPSS version 18, the labels appear as garbled text. I am using the latest development version 0.7.2. Should this be working correctly? Is anyone else having success writing utf-8 via the PSPP::Perl module? Thanks,

Rob

use PSPP;

my $dict = PSPP::Dict->new ();

my $var1 = PSPP::Var->new ($dict, "Q1", (fmt=>PSPP::Fmt::F, width=>2, decimals=>0) );
$var1->add_value_label (0, q|航空和国防|);
$var1->add_value_label (1, q|无线通讯|);

my $sysfile = PSPP::Sysfile->new ('testfile.sav', $dict);
$sysfile->close();

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re; Re: Dutch translation

2009-11-25T00:54:56Z

>There must be a way we can automate this?
>
>J'

I did some research. Have a look at
http://git.savannah.gnu.org/cgit/bison.git/tree/bootstrap I guess if
Ben includes this in the nightly builds, the translations are always
up to date.

Have fun

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Re: Re: PSPP build for Karmic

2009-11-24T01:19:08Z

Hi,

> is output branch same as 0.7.2 branch?

Nop.

Current version is 0.6.2
Stable version is 0.6.2 (with fixes)
Master is 0.7.2 (the development version with the newest features but
it might be unstable)
Output branch is ..... (the version which gives an impression of the
new output system)

Have fun

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Re: covariance test success

2009-11-23T12:01:34Z

On Sat, Nov 21, 2009 at 08:12:00AM +0000, John Darrington wrote:

> So, to answer the question what to do next, I propose:
>
> 1. Change REGRESSION etc. to use new covariance routines. and test thoroughly.
>
> 2. Fix up the missing value problem and write some rigorous test routines.
>
> 3. Drop the existing src/category.c and covariance-matrix.c
>
> 4. Merge ?
>
> 5. Extend src/math/categoricals.c to work with interactions between arbitrary
> permutations of variables. Possibly the file should be renamed to
> src/math/interactions.c or similar ?
>
> 6. Write a super-dooper GLM routine using the new modules.

This sounds good to me. I'll start changing files on the covariance
branch to make use of covariance.c.

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Re: PSPP build for Karmic

2009-11-23T09:23:09Z

Hi,

> Agreed, is output branch same as 0.7.2 branch? Think that both 0.6.2 and 0.7.2 should
> be available as packages.
0.6.1 (it seems this version was stable at the time of compiling) is
available through official community repository:
http://packages.ubuntu.com/karmic/pspp

Binaries for output are not ready yet.

bye, Matej

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RE: Feature request

2009-11-23T09:13:09Z

Couldn't this be done in syntax mode, using the VALUE LABELS command?

From PSPP guidebook (same as SPSS):

VALUE LABELS
/var list value ’label’ [value ’label’]. . .
VALUE LABELS allows values of numeric and short string variables to be associated
with labels. In this way, a short value can stand for a long value.
To set up value labels for a set of variables, specify the variable names after a slash (‘/’),
followed by a list of values and their associated labels, separated by spaces. Long string
variables may not be specified.
Before VALUE LABELS is executed, any existing value labels are cleared from the
variables specified. Use ADD VALUE LABELS (see Section 8.1 [ADD VALUE LABELS],
page 70) to add value labels without clearing those already present.

-Peter
________________________________________
From: pspp-users-bounces+pgalderisi=ucsd.edu@... [pspp-users-bounces+pgalderisi=ucsd.edu@...] On Behalf Of Kristoffer Ericson [kristoffer.ericson@...]
Sent: Monday, November 23, 2009 8:45 AM
To: pspp-users@...
Subject: Feature request

Greetings,

When I load my survey I get the numerical values of peoples answers (e.g 1 = yes, 2 = maybe ...).
I then create the labels for each question and this works fine. However since the labels are
usually the same on multiple questions, couldnt an option be added like "copy labels from question X".

I have alot of questions and it takes awhile to add labels to them all.
Anyhow, just a thought.

Best wishes
Kristoffer

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Feature request

2009-11-23T08:45:55Z

Greetings,

When I load my survey I get the numerical values of peoples answers (e.g 1 = yes, 2 = maybe ...).
I then create the labels for each question and this works fine. However since the labels are
usually the same on multiple questions, couldnt an option be added like "copy labels from question X".

I have alot of questions and it takes awhile to add labels to them all.
Anyhow, just a thought.

Best wishes
Kristoffer

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Re: PSPP build for Karmic

2009-11-23T08:24:06Z

Agreed, is output branch same as 0.7.2 branch? Think that both 0.6.2 and 0.7.2 should
be available as packages.

On Mon, 23 Nov 2009 16:52:06 +0100
Karel Novotny <novotny.karel@...> wrote:

> Thanks Matej, this is great.
>
> karel
>
> On Mon, 2009-11-23 at 16:41 +0100, Matej Kovacic wrote:
> > Hi,
> >
> > here is PPA (Personal Package Archive) repository for Karmic:
> > https://launchpad.net/~gandalf/+archive/pspp
> >
> > Installation
> > ============
> >
> > 1. Add PPA reposiory to you sources list:
> > sudo add-apt-repository ppa:gandalf/pspp
> >
> > 2. Install:
> > sudo apt-get install pspp
> >
> > There are three builds: amd64, i386 and lpia.
> >
> > We are planning to make binaries for output branch also. And working on
> > wiki as well...
> >
> > bye, Matej
> >
> >
> > _______________________________________________
> > Pspp-users mailing list
> > Pspp-users@...
> > http://lists.gnu.org/mailman/listinfo/pspp-users
> >
>
>
>
>
> _______________________________________________
> Pspp-users mailing list
> Pspp-users@...
> http://lists.gnu.org/mailman/listinfo/pspp-users

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Re: PSPP build for Karmic

2009-11-23T07:52:06Z

Thanks Matej, this is great.

karel

On Mon, 2009-11-23 at 16:41 +0100, Matej Kovacic wrote:

> Hi,
>
> here is PPA (Personal Package Archive) repository for Karmic:
> https://launchpad.net/~gandalf/+archive/pspp
>
> Installation
> ============
>
> 1. Add PPA reposiory to you sources list:
> sudo add-apt-repository ppa:gandalf/pspp
>
> 2. Install:
> sudo apt-get install pspp
>
> There are three builds: amd64, i386 and lpia.
>
> We are planning to make binaries for output branch also. And working on
> wiki as well...
>
> bye, Matej
>
>
> _______________________________________________
> Pspp-users mailing list
> Pspp-users@...
> http://lists.gnu.org/mailman/listinfo/pspp-users
>

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PSPP build for Karmic

2009-11-23T07:41:27Z

Hi,

here is PPA (Personal Package Archive) repository for Karmic:
https://launchpad.net/~gandalf/+archive/pspp

Installation
============

1. Add PPA reposiory to you sources list:
sudo add-apt-repository ppa:gandalf/pspp

2. Install:
sudo apt-get install pspp

There are three builds: amd64, i386 and lpia.

We are planning to make binaries for output branch also. And working on
wiki as well...

bye, Matej

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Re: Problem with gettext on master branch

2009-11-23T06:27:49Z

Hello John,

It works! Thank you!

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Re: Problem with gettext on master branch

2009-11-21T23:57:12Z

On Sun, Nov 22, 2009 at 01:16:53AM -0200, michel wrote:

> What is the name of the library in mingw ?
It is libintl.dll.a

Can you try the following patch to configure.ac - you may
have to adjust it a bit - I don't have a mingw system to test
on. Let me know what happens.

diff --git a/configure.ac b/configure.ac
index 95dfc66..1ef538b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,6 +40,7 @@ fi
dnl Checks for libraries.
AC_SYS_LARGEFILE
AC_SEARCH_LIBS([sin], [m])
+AC_SEARCH_LIBS([dcgettext], [intl])
PSPP_LIBPLOT
PSPP_LC_PAPER
AM_CONDITIONAL(WITHCHARTS, test x"$with_libplot" != x"no")

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Re: Problem with gettext on master branch

2009-11-21T19:16:53Z

> What is the name of the library in mingw ?
It is libintl.dll.a

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Re: covariance test success

2009-11-21T00:12:00Z

Interactions are not so onerous as they appear. If I have grasped the
idea correctly, we can generalise src/math/categoricals.c to calculate
even the most complicated interactions like Jason describes. After all,
a categorical variable is a degenerate case of an interaction (one which
has only a single variable).

So if we implement all the routines using the existing src/math/categoricals.c
and src/math/covariance.c then I believe we can extend to routines requiring
interactions without changing anything other than those modules (and some
syntax parsing of course).

One problem with the existing src/math/categoricals.c is that it doesn't
properly handle missing values. Missing values create more problems than is
immediately apparent, because they add another dimension to the task. In
fact I think that missing values are going to be a more challanging problem
than interactions.

So, to answer the question what to do next, I propose:

1. Change REGRESSION etc. to use new covariance routines. and test thoroughly.

2. Fix up the missing value problem and write some rigorous test routines.

3. Drop the existing src/category.c and covariance-matrix.c

4. Merge ?

5. Extend src/math/categoricals.c to work with interactions between arbitrary
permutations of variables. Possibly the file should be renamed to
src/math/interactions.c or similar ?

6. Write a super-dooper GLM routine using the new modules.

This programme does mean that user visible changes are implemented last, but
I would rather have robust features introduced later than fragile ones earlier.
Also, as I said, my biggest doubt at the moment is the missing values vs. categoricals
issue. To my mind, it's the single issue which is most likely to require
major redesign of categoricals.c - if it does, then I'd rather find out early.

J'

On Fri, Nov 20, 2009 at 04:57:24PM -0500, Jason Stover wrote:
On Fri, Nov 20, 2009 at 03:44:11PM -0500, Jason Stover wrote:
> So when do we merge?

Not yet, I think.

I was just looking at what needs to be done to make interactions
possible for the GLM procedure. I also discussed this with Ben
via IRC.

It seems that adding the interactions is going to be trickier than
just fixing the code in interaction.c. An interaction for us is just a
product of values of two or more variables. So, for example, if var1
and var2 interact, we would need to compute all possible combinations
of values of var1 an var2. Each of these combinations would go into
computing the covariance matrix, just as any other values would.

So an "interaction" must be like a variable, in that it has at least
one column in a covariance matrix.

Next, if var1 and var2 are numeric, a "combination" of their values is
just their product. This is easy to compute as we pass the data. So to
include the interaction of var1 and var2 in the covariance matrix, we
would just make a new variable, pass that to the constructor for the
covariance matrix, and for each case in our data-reading loop, compute
the product of the values of var1 and var2, append that to the case,
and send that case along to covariance_accumulate_pass[12].

The complication enters if var1 is categorical and var2 is
numeric. Then, instead of having bit-vectors as computed in
category.c, we would need the scalar product of the numeric value from
var2, times the bit vector from var1. So for example, if we
encountered var1's value 'a', encoded that as (0 0 1 0), and a 2.2 for
var2, then we would need to use (0 0 2.2 0) in the computation of the
covariance matrix. This raises some obvious questions about what that
interaction should be: It can't be a variable because it has both
categorical and numeric attributes. How should it be appended to the
case being read? How should covariance.c deal with it?

There is a further complication if both var1 and var2 are
categorical. Now we must encode the interaction as a bit vector for
its use in computing the covariance. So for example, if we see 'a' for
var1 and 'b' for var2, we should encode that as, say, (0 0 1 0 0
0 0). Now if we have n categories for var1 and m categories for var2,
then we would have n*m categories for var1 interacting with var2,
which means we would need a bit vector of length n*m - 1 to handle the
interaction between var1 and var2. Where should this be stored? Maybe
some function to smash the two values together and append it to the
case being read? I don't know.

Here is a further complication: The user could specify any number of
variables in an interaction. So instead of var1 interacting with var2,
the user could specify var1, var2,... vark all interacting
together. This would be a bad idea for most experimental designs, but
it is computationally just fine.

So the question of how to make interactions seems difficult because
its answer must involve reading cases, computing new variables, and
encoding vectors from strings and numeric values. I'm asking how to
do this here, because the last time I tried it I made a mess. But it
is important, and necessary for a GLM command and many other modeling
procedures.

Any suggestions? (John, you want to just code this up over lunch?)

>
> And what to do next? Here is a list of tasks that
> stem from having the new covariance.[ch]:
>
> 1. Change linreg.c, coefficient.c and regression.q to use the new covariance
> routines.
>
> 2. Drop src/data/category.c and covariance-matrix.[ch].
>
> 3. Rewrite interaction.c to use covariance.c.
>
> I would prefer to finish a GLM before changing linreg.c too much, but
> I'm afraid doing so will just make more work later. Also, linreg.c
> will have to be changed to use the new covariance struct anyway, and
> doing so without dropping its current behavior of using the entire
> data set would make it a lot uglier in the meantime.
>
>
>
> _______________________________________________
> pspp-dev mailing list
> pspp-dev@...
> http://lists.gnu.org/mailman/listinfo/pspp-dev

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Re: covariance test success

2009-11-20T13:57:24Z

On Fri, Nov 20, 2009 at 03:44:11PM -0500, Jason Stover wrote:
> So when do we merge?

Not yet, I think.

I was just looking at what needs to be done to make interactions
possible for the GLM procedure. I also discussed this with Ben
via IRC.

It seems that adding the interactions is going to be trickier than
just fixing the code in interaction.c. An interaction for us is just a
product of values of two or more variables. So, for example, if var1
and var2 interact, we would need to compute all possible combinations
of values of var1 an var2. Each of these combinations would go into
computing the covariance matrix, just as any other values would.

So an "interaction" must be like a variable, in that it has at least
one column in a covariance matrix.

Next, if var1 and var2 are numeric, a "combination" of their values is
just their product. This is easy to compute as we pass the data. So to
include the interaction of var1 and var2 in the covariance matrix, we
would just make a new variable, pass that to the constructor for the
covariance matrix, and for each case in our data-reading loop, compute
the product of the values of var1 and var2, append that to the case,
and send that case along to covariance_accumulate_pass[12].

The complication enters if var1 is categorical and var2 is
numeric. Then, instead of having bit-vectors as computed in
category.c, we would need the scalar product of the numeric value from
var2, times the bit vector from var1. So for example, if we
encountered var1's value 'a', encoded that as (0 0 1 0), and a 2.2 for
var2, then we would need to use (0 0 2.2 0) in the computation of the
covariance matrix. This raises some obvious questions about what that
interaction should be: It can't be a variable because it has both
categorical and numeric attributes. How should it be appended to the
case being read? How should covariance.c deal with it?

There is a further complication if both var1 and var2 are
categorical. Now we must encode the interaction as a bit vector for
its use in computing the covariance. So for example, if we see 'a' for
var1 and 'b' for var2, we should encode that as, say, (0 0 1 0 0
0 0). Now if we have n categories for var1 and m categories for var2,
then we would have n*m categories for var1 interacting with var2,
which means we would need a bit vector of length n*m - 1 to handle the
interaction between var1 and var2. Where should this be stored? Maybe
some function to smash the two values together and append it to the
case being read? I don't know.

Here is a further complication: The user could specify any number of
variables in an interaction. So instead of var1 interacting with var2,
the user could specify var1, var2,... vark all interacting
together. This would be a bad idea for most experimental designs, but
it is computationally just fine.

So the question of how to make interactions seems difficult because
its answer must involve reading cases, computing new variables, and
encoding vectors from strings and numeric values. I'm asking how to
do this here, because the last time I tried it I made a mess. But it
is important, and necessary for a GLM command and many other modeling
procedures.

Any suggestions? (John, you want to just code this up over lunch?)

>
> And what to do next? Here is a list of tasks that
> stem from having the new covariance.[ch]:
>
> 1. Change linreg.c, coefficient.c and regression.q to use the new covariance
> routines.
>
> 2. Drop src/data/category.c and covariance-matrix.[ch].
>
> 3. Rewrite interaction.c to use covariance.c.
>
> I would prefer to finish a GLM before changing linreg.c too much, but
> I'm afraid doing so will just make more work later. Also, linreg.c
> will have to be changed to use the new covariance struct anyway, and
> doing so without dropping its current behavior of using the entire
> data set would make it a lot uglier in the meantime.
>
>
>
> _______________________________________________
> pspp-dev mailing list
> pspp-dev@...
> http://lists.gnu.org/mailman/listinfo/pspp-dev

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