Thanks for replying John.
Actually, what I want is the /ORIGIN command (force model to go through origin;
i.e. no const term).
I can't fake it by adding a dummy variable with all cases set to zero for three
reasons:
1) PSPP does not support weighted multiple linear regression, so adding a
single dummy variable to a dataset which already contains hundreds of data
points would not force the model's Y intercept to be zero
2) Without weighting, it would be necessary to add hundreds (if not thousands)
of dummy data points to force the model's Y intercept to be zero. This would
be unwieldy.
3) Adding hundreds (or thousands) of dummy data points would skew other
statistical measures I am interested in.
The following free statistics programs all support zero Y-intercept (no const
term) multiple linear regression models:
gretl
R
Octave
Tanagra
ASP
MicrOsiris
LibreOffice Calc
So why don't I just use one of them instead? Well, I have and I do. But I
have several applications where I want to use PSPP; for example when working
with students with prior exposure to SPSS.
From: John Darrington <j...@darrington.wattle.id.au>
To: Ether <eth...@ymail.com>
Cc: "pspp-users@gnu.org" <pspp-users@gnu.org>
Sent: Thursday, September 1, 2016 7:57 PM
Subject: Re: PSPP multiple linear regression with Y intercept equal zero
Ether,
I'm not an expert on linear regression, but I think you are looking for the
/NOORIGIN
subcommand which unfortunately at the moment PSPP doesn't have.
If this is important to you, file a "wishlist" bug and we'll ses what we can do.
In the mean time, you can "fake it" by adding a dummy variable with all cases
set
to zero.
J'
On Thu, Sep 01, 2016 at 09:33:32PM +0000, Ether wrote:
Only 2 posts to the PSPP mailing list in the past 7 days.
Is there a more active PSPP mailing list (or better yet, forum) somewhere?
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