Cohort reports are reports where your results are grouped together by a certain property. This allows you see in aggregate how well you've performed and identify where your strengths might lie.
Take, for example, the sport cohort report. In this table, you will see your performance grouped by sport: How well you have done in NFL contests vs. NBA vs. MLB, for example. At a glance, you can see how much you have won overall in each sport (the profit column), your overall return on investment (ROI), total amount wagered, and more.
There are over a dozen cohort reports in RotoTracker (a few are exclusive to RotoTracker+):
Note a subtle difference here: Weekday is a facet cohort because is groups by a specific property, answering a question like, "how do I perform on Wednesdays, by aggregate?" Whereas the "Day" cohort in dates groups results by each calendar day — "how did I perform across all contests on this specific Wednesday in July?"
As with all reports, any filters will apply to your cohorts. So, you can filter to only DraftKings results, and set a time period filter to this year, set an entry fee of max $5, then view the Sport cohort report to answer the question: "What was my best and worst sport this year playing low-stakes contests on DraftKings?"
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