Re: st: regression using generalized linear model

[Nick Cox <njcoxstata@gmail.com>]

Well spotted, but in turn Aidan said that syntax didn't work in Stata.

Nick
njcoxstata@gmail.com

On 11 March 2014 18:51, Joe Canner <jcanner1@jhmi.edu> wrote:

> 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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