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: r-help-bounces@stat.math.ethz.ch im Auftrag von Celso Barros
Gesendet: Fr 07.07.2006 07:13
An: r-help@stat.math.ethz.ch
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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