CirrusSearch collects data on 1 in 200 search sessions, sometimes that is
increased to say 1:100 and the extra users are split into buckets as part
of the AB test using this javascript:
https://github.com/wikimedia/mediawiki-extensions-WikimediaEvents/blob/master/modules/ext.wikimediaEvents.searchSatisfaction.js#L100-L158

On Thu, Sep 8, 2016 at 11:26 AM, James Forrester <[email protected]>
wrote:

> On Wed, 7 Sep 2016 at 00:16 Jan Dittrich <[email protected]>
> wrote:
>
>> Hello Analytics,
>>
>> A while ago I asked about the existence of any A/B-Testing Framework. I
>> got to know (Thanks, Nuria!) that https://phabricator.wikimedia.
>> org/T135762 is in preparation. However, I assume, that until this is in
>> place, we need to use custom solutions which utilize EventLogging.
>> Event logging itself is pretty clear to me, but not the splitting/cookie
>> logic.
>>
>> Could anybody link me some examples for such a self implemented way to
>> show users their assigned content and, if they are not assigned to a group
>> yet, to assign users to A/B… bins?
>>
>
> Here's the code for MW-VE to add a proportion of new accounts to have VE
> on by default, used when slowly ramping up deployment or for an A/B test:
> https://phabricator.wikimedia.org/diffusion/EVED/
> browse/master/VisualEditor.hooks.php;7fe96fc2380743b4e63f4bb7c03e2e
> bf2b2e1038$964 — hope that helps.
>
> J.
> --
>
> James D. Forrester
> Lead Product Manager, Editing
> Wikimedia Foundation, Inc.
> jforrester at wikimedia.org 
> <https://lists.wikimedia.org/mailman/listinfo/wikimedia-l> | @jdforrester
>
>
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