Hi all, I am using Logistic Regression in SPSS and the following question came to me: I want approximately the same percentage of success (fail) in group prediction for each of the two groups of the variable I want to predict. To get this goal, is the best way to weight cases and force the data to have the same number of cases in each group? Actually my data is totally unbalanced, Group1 700 cases, Group2 13000 cases and the best group-prediction I get without weighting cases is: Prediction=Group2. How this can change the prediction probability? Where can I find documentation on this? Thanks in advance Llorenç Badiella [EMAIL PROTECTED] Sent via Deja.com http://www.deja.com/ Before you buy. =========================================================================== This list is open to everyone. Occasionally, less thoughtful people send inappropriate messages. Please DO NOT COMPLAIN TO THE POSTMASTER about these messages because the postmaster has no way of controlling them, and excessive complaints will result in termination of the list. For information about this list, including information about the problem of inappropriate messages and information about how to unsubscribe, please see the web page at http://jse.stat.ncsu.edu/ ===========================================================================
