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Dear allstaters, I would appreciate some methodological advice. I would like to study the interactive effect of 2 categorical (ordinal) variables towards the prediction of a dichotomous outcome (mortality). Ideally, I would like to control theses analyses by age. What statistical technique would be most appropriate? I am using SPSS v.22 Many thanks in advance Roman Romero-Ortuno You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.