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Hello
The syntax below is illustrative of what has been obtained from the SPSS paste option during my performance of a Cox regression analysis using the Forward LR procedure.
COXREG
oneyeartime /STATUS=oneyearstatus(1)
/CONTRAST (factor1)=Indicator /CONTRAST (factor2)=Indicator /CONTRAST
(factor3)=Indicator /CONTRAST (factor4)=Indicator /CONTRAST
(factor5)=Indicator /CONTRAST (factor6)=Indicator /CONTRAST
(factor7)=Indicator /CONTRAST (factor8)=Indicator /CONTRAST
(factor9)=Indicator /CONTRAST (factor10)=Indicator /CONTRAST
(factor11)=Indicator /CONTRAST (factor12)=Indicator /CONTRAST
(factor13)=Indicator /CONTRAST (factor14)=Indicator
/METHOD=FSTEP(LR) factor1 factor2 factor3 factor4 factor5 factor6
factor7 factor8 factor9 factor10 factor11
factor12 factor13 factor14
/CRITERIA=PIN(.25) POUT(.80) ITERATE(20) .
In this illustration, there are 14 factors. However, I wish to find an efficent way to code for all two-way interactions between all of these factors without having to write them all out explicitly. Can anyone provide me with the necessary conccise syntax which I should use to edit the above syntax so as to ensure that all two-way interactions are represented?
Many thanks
Best wishes
Margaret
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