RE: st: regression using generalized linear model

[Joe Canner <jcanner1@jhmi.edu>]

Actually, Aidan provides us with most of the answer in his post.  He indicates that variable -a- is a "string character" and that -u- "contains non integer and negative values".

Nick has suggested a fix for string variables (-encode-). -destring- may also work.  I don't remember enough about PROC GLM to know how u*u should be translated into Stata.  If the asterisk is an interaction, perhaps a hash(#) would work better in Stata. 

Incidentally, how did Aidan get the asterisks to work at all in Stata?  Is that new in version 13?

Joe

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Tuesday, March 11, 2014 2:40 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: regression using generalized linear model

I've never used SAS but I have used Stata [NB].

But the message does explain the problem, which may be why no-one
answered this first time this was asked.

At least one of your variables -v y u t a b- contains something other
than integers. So,

. codebook v y u t a b

to see which variable(s) don't come up to scratch. Perhaps one is
string. Even if SAS permits string predictors (I don't know its
terminology), Stata expects you to -encode- string variables before
using them in -anova-.

(Please note our policy on repeating posts. It's best to wonder why a
post didn't get answered, and revise it, and not to seem too
impatient.)

Nick
njcoxstata@gmail.com

On 11 March 2014 18:28, Aidan Trung Nguyen <aidant@mit.edu> wrote:

> I'm trying to write the STATA equivalent of the followingSAS statement:
>
> proc glm data=datasetclass a b model x = v*y*y    u*u    t    a*b
> weight w
> output out = outputdataset
>
>
> a is a string character
> b, x, v, y, u, t are numeric
> u contains non integer and negative values
>
> I tried the below command but without success:anova x  v*y*y   u*u  t   a*b
>
> error message : factor variables may not contain non integervalues Any guidance is much appreciated.
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