How can you choose variations for several content experiments?

Question

I\'m using the Javascript API for Google Analytics Content Experiments and it seems like you have two choices:

1. Run one experiment at a time and have Google ass

Answer 1

I solved this using a node.js script.

Out-of-the-box Google Content Experiments makes you choose between:

• Load cxApi patched only for 1 experiment
• Load cxApi plain, and lose the ability to call chooseVariation() function, making you implement your own choosing algorithm (which is a shame, as google's multi-armed bandit idea is really smart).

So I did some reverse engineering on how google cxApi js is patched for 1 experiment, it turns it out it just bundles the experiment info (the variations weights) in the middle of the file, I experimented touching the bundle manually adding multiple experiments, and now I can call cxApi.chooseVariation(experimentId) for each experiment, and works nicely!

Weights change every 12hs, so I automated it, I created a node.js little app that will download cxApi from google, and then repeatedly download it for each experiment you specify, and patch a cxApi with all your experiments on it.

Voila!, multiple experiments on any page.

Here's the repo: https://github.com/benjamine/mutagen, fork at will

this node.js app will patch cxApi for multiple experiments, and will also pack (and minify) your variations