Hi! I am trying to make a stepwise regression in the multivariate case, using Wilks' Lambda test. I've tried this: > greedy.wilks(cbind(Y1,Y2) ~ . , data=my.data ) But it only returns: Error in model.frame.default(formula = X[, j] ~ grouping, drop.unused.levels = TRUE) : variable lengths differ (found for 'grouping') What can be wrong here? I have checked and all variables in my.data is of the same length. //Jonathan [[alternative HTML version deleted]]
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