maccman / abba

A/B testing framework
MIT License
1.35k stars 70 forks source link

1 vs 2-tailed test? #1

Open mkdynamic opened 11 years ago

mkdynamic commented 11 years ago

Looks like you are using a 1-tailed test to calculate the probability. Is that correct? I see both ways used in different A/B testing tools (Optimzely use a 1-tailed test, I believe).

Curious as to the thinking behind the choice.