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Re:How we reduced our cancellation rate by 87.5% by jamiequint on Sunday June 17, 2012 @10:46AM (#4123041)
Ah, the article is actually extremely unclear. What I took his conclusion to mean was that some cohort of gyms that had signed up post-change had lower cancellation rates than pre-change customers. If the analysis just took into account the overall rate across all customers is prone to all sorts of errors (including the one you mention).
Re:How we reduced our cancellation rate by 87.5% by ehsanu1 on Sunday June 17, 2012 @02:49PM (#4123531)
My impression was that the pre-change cancellation rate was based on all customers over the lifetime of the product (they did calculate the 61 day average from this), whereas the post-change was only for the new customers in the last two months (the max it could be, and the only thing it makes sense to measure).