Dear Peter and Florian,
I think you have spotted the problem, thank you very much. I checked
the frequencies, and R is not understanding that the (-1) value in a binary
variable was defined in SPSS as "sysmis". This was precisely the variable
that showed the larger difference (it's the only binary variable in the
model). Thanks a lot.
I am still trying to make R understand that, though. If I could
avoid defining missing values inside R for each of the variables in the
dataset, I would be happy. Does anyone know if there is a command in
foreign, for instance, that ensures that things coded as sysmis in SPSS are
read as sysmis in R?
Thanks again, this has been very, very helpful
Celso
On 7/7/06, Florian Koller <[EMAIL PROTECTED]> wrote:
>
> If results are *very* different, I would suspect that R treated
> "experien" as a factor (when you use "read.spss" the default is to use
> value labels, which makes R treat such variables as factors --> set "
> use.value.labels = F").
> Another explanation could be missing data in SPSS (not sysmis, but coded
> with, say -99) that are not recognized by R.
>
> Florian
>
> ------------------------------
> *Von:* [EMAIL PROTECTED] im Auftrag von Celso Barros
> *Gesendet:* Fr 07.07.2006 07:13
> *An:* [email protected]
> *Betreff:* [R] Diverging results with SPSS
>
>
>
> Dear List,
>
> I apologize in advance if this is silly. I tried to replicate an analysis
> I
> did previously in SPSS using R, and was surprised to find different
> results.
>
>
> So my question is: shouldn't the following SPSS syntax
>
>
> REGRESSION
>
> DEPENDENT INC89
>
> /METHOD=ENTER hiedyrs experien SE93rec.
>
> Yeld the same results of the following R command
>
> modelB<-lm(INC89~HIEDYRS+EXPERIEN+SE93REC)
>
>
> I assume the is some difference in some default options.Or maybe it was a
> problem when the data was imported. After using the read.spss in the
> foreign
> package, I got the following warning message:
>
> Unrecognized record type 7, subtype 16 encountered in system file
>
> Thanks in advance for the help and apologies for the trouble,
>
>
> Celso
>
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>
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