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...repeated observations" - I think perhaps they meant repeated measures in retrospect I am a total beginer to ARIMA, but have read a a basic text. I read that ARIMA requires a minimum of 50 repeated measures in time (repeated measures)- Unfortunately, I have 8 repeated measures of the same psychiatirc appraisal the sample sizes was decent (n > 200). Is ARIMA violated or does it remain robust under such circumstances? Is there a viable alterative to ARIMA out there to analyze a trend of 8 repeated measures w. > 200 cases? Many thanks Stephen ???? ?"? ???? ???? http://mail.nan...