You need to be VERY careful using Google Analytics as a backend. After a certain threshold, they start sampling your data, and results will therefore become highly inaccurate.
Disclaimer: I also created an A/B test open-source framework with Google Analytics as (one potential) backend, but then realized it's sub-optimal. I wrote about it on [0].
Disclaimer: I also created an A/B test open-source framework with Google Analytics as (one potential) backend, but then realized it's sub-optimal. I wrote about it on [0].
[0] http://blog.gingerlime.com/2016/a-scaleable-ab-testing-backe...