Thanks Dan. I actually wrote a piece a couple years back about this as well: http://drjasondavis.com/blog/2013/09/12/eight-ways-youve-misconfigured-your-ab-tes

Thanks Dan. I actually wrote a piece a couple years back about this as well: http://drjasondavis.com/blog/2013/09/12/eight-ways-youve-misconfigured-your-ab-test http://drjasondavis.com/blog/2013/09/12/eight-ways-youve-mis... Can't tell you how many bad a/b tests we ran at Etsy until we figured things out ;)