After reading quite a bit about cohort analysis[1][2] (including Fred Wilson's[3]), this line made me understand why it is so important. [1] http://blog.500sta

After reading quite a bit about cohort analysis[1][2] (including Fred Wilson's[3]), this line made me understand why it is so important. [1] http://blog.500startups.com/2011/07/13/cohort-metrics-for-startups-revealed-part-i-plain-english/ http://blog.500startups.com/2011/07/13/cohort-metrics-for-st... [2] http://www.startuplessonslearned.com/2008/09/one-line-split-test-or-how-to-ab-all.html http://www.startuplessonslearned.com/2008/09/one-line-split-... [3] http://www.avc.com/a_vc/2009/10/the-cohort-analysis.html http://www.avc.com/a_vc/2009/10/the-cohort-analysis.html