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Level 7

Hi, I have been looking at the cohort analysis and it appears quite constraining. If i run it over a historic time period say 1st Dec 2014 - 15th Dec 2014 on a daily basis it doesn't populate all the following days i.e. 15th Dec 2014 has no data for Day 1 onwards. This data does exist as it is a historic date period. The only day you get the full day 1 to day 14 return data is for the very first day in your time period. Am i doing something wrong here? It is very frustrating.