Missed the question back to me, sorry. Mixed cohorts might occur due to
the output as user IDs while collection is of usernames - say someone has a
repeating events and has a csv output of data for those new users that were
retained at a certain activity level from Point A to B and then has new
cohort members opt in at Point B but only wants to include those that
already survived from Point A and new at Point B cohort members for
examining at another Point C. Without the output of usernames to create
the active Point B cohort separately this would make the Point C cohort a
mix of qualified user ids and new user names. There are several ways of
dealing with this, it was just the first scenario I could think of that
could cause this. Seems we still need to revisit the possibility of
accessing usernames as output, also for reasons of matching to other data
points where most users and most program leaders do not know user ids -
Jaime
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On Fri, Nov 22, 2013 at 4:04 PM, Dario Taraborelli <
dtaraborelli@wikimedia.org> wrote:
> that works for me, thanks!
>
> Jaimee – can you give us more details on the use case for mixed cohorts
> that you had in mind?
>
> On Nov 22, 2013, at 3:28 PM, Dan Andreescu
dandreescu@wikimedia.org
> wrote:
>
>
>> So, for now, until I figure out how to fix this, it will always prefer
>>> user_names before user_ids.
>>
>>
>> I think this is an argument for making users specifying whether it's
>> names or ids up front, and not allowing mixtures. Assuming it might be a
>> mixture and looking for names first is almost certain to produce inaccurate
>> results at some point. We have ids precisely to avoid collisions with
>> names, allowing for renaming users, and other cases.
>>
>
> Yep, I just learned this the hard way and made a fool of myself in front
> of a bunch of people I admire. So, I'd be glad if I'm the only one that
> this happens to. If nobody objects, I'm going to allow the user to select
> whether their cohort contains user_ids OR user_names, and strictly prohibit
> mixtures.
>
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