Hi there I have found several posts on this subject but have not managed to solve my problem yet. I am running a mixed model on a dataset with 30 subjects who have got an average of 4000 measurements each (The highest number of measurements per subject is 16000). I have run the model using the RANDOM statement (with a random intercept for each subject) and it worked fine. However, I would like to change the covariance structure to an autogressive one. For this reason I have been trying to use the REPEATED statement and I keep getting the following error ERROR: Integer overflow on computing amount of memory required. A request to allocate 5952.94M bytes of memory can not be honored. ERROR: The SAS System stopped processing this step because of insufficient memory. I tried to make the model the simplest possible (without any fixed effect) and I have tried to change the DDFM option but it still doesn't work. Does anyone know how to fix it? Thanks a lot!!!
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