Hi David
My data set has about 20 significant variables and  step function with logistic regression is working fine( in R-commander). I tried to get conditional logistic by introducing the stratum variable and clogit. The clogit is not converging but is giving the summary of the model. When step/step AIC/..are used, the message given is "ERROR: number of rows in use has changed". 
 
Thanks
Subha


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