Hi there analytics,Wanted to get your input on something. Our grantee partner Jake Orlowitz (cc'd) is planning out the pilot evaluation for The Wikipedia Adventure.We haven't hammered out the details yet, but it looks like he will be comparing editing behavior between at least 2 cohorts: editors who were invited to play TWA and who completed at least the first mission, and a control group of editors who met the same basic criteria (joined around the same time, met a minimum edit threshold). The TWA pilot will last at least a month, and new editors will be invited on a rolling basis throughout that month. We'd like to examine the editing behavior of each editor AFTER the date they were invited to TWA (or would have been, in the case of the control group).Currently, it looks like Wikimetrics only lets you specify a date range at the level of the cohort; that won't work for this analysis, since we want to exclude edits made before a given date, which will vary user-by-user. Could WikiMetrics be updated to allow researchers to set user-level date ranges? I'm thinking potentially this could be an optional field in the upload CSV.I think this feature would be useful beyond TWA. The current setup works well for offline events, where everyone in a cohort is receiving the same "treatment" at exactly the same time. But for many online initiatives--such as volunteer-driven email and social media campaigns & editor engagement experiments like TWA, Teahouse, Image and translation drives, etc.--the cohorts won't necessarily fit neatly into single-date buckets.We have a little time to talk this through: the TWA pilot hasn't started yet, and we won't be analyzing data for at least a month and a half, but I wanted to get the conversation started.Cheers,Jonathan--Jonathan T. MorganLearning StrategistWikimedia Foundation