The two HN discussions I found that seemed to have useful info on cohort analysis:<p><a href="https://news.ycombinator.com/item?id=5245571" rel="nofollow">https://news.ycombinator.com/item?id=5245571</a> (Cohort analysis - User retention in a Rails application, 203 days ago)<p><a href="https://news.ycombinator.com/item?id=4122000" rel="nofollow">https://news.ycombinator.com/item?id=4122000</a> (How we reduced our cancellation rate by 87.5%, 450 days ago)<p>The second link references the following class: <a href="http://www.skillshare.com/classes/business/Data-to-Dollars-Using-Cohort-Analysis-to-Plug-Your-Leaky-Holes/794424332/2002269540" rel="nofollow">http://www.skillshare.com/classes/business/Data-to-Dollars-U...</a> ($35; 90 minutes in NY)