All, I have the attached dataset which I read from SPSS and transformed a little bit using the attached script. I am trying to run a logistic regression using glm() on a subset of my data. When I run the logistic regression on the whle dataset, it runs OK. As soon as I try to run on the subset, I get an error message related to different lengths of variables. Any idea why this might be so? Thanks for your inputs. V
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