Hello all.

@Tim: By "feature" I mean having values for column user.user_registration filled for DB replicas accessible from Tool-Labs, if possible. As Oliver has suggested, I don't see any reason for this info not being available, as it is already public from Special:ListUsers.

@Aaron: Thanks a lot. I belive that is a fairly decent approximation. In fact, I suspect that daily or weekly aggregates would be enough for time-series characterization. My actual goal is comparing trends between different languages, and eventually correlation with other known activity metrics.

Best regards,
Felipe.

El Viernes 14 de febrero de 2014 16:00, Aaron Halfaker <aaron.halfaker@gmail.com> escribió:

I have a dataset containing estimated registration dates for editors who registered before Dec. 2005.  My method assumes that user_id is monotonically increasing and sets the lowest upper-bound available.  

For example.  Let's assume the following rows:

    user_id    first_edit

    12345      20040102030405  

    12344      NULL

    12343      20040102050102

Since an editor couldn't have saved a revision before registering their account, we can assume that user 12345 registered there account on or before 20040102030405.  If user_id is monotonically increasing, we also know that user 12344 must have registered on or before 20040102030405, which lets us fill in a NULL.  Similarly, we have a first_edit timestamp for user 12343, but that edit happened pretty late.  We can actually just continue to propagate the 20040102030405 timestamp to this user too.

After performing this approximation, we'd have the following rows:

    user_id    first_edit        user_registration_approx

    12345      20040102030405    20040102030405

    12344      NULL              20040102030405

    12343      20040102050102    20040102030405

In effect, this is similar to the approximation discussed in https://bugzilla.wikimedia.org/show_bug.cgi?id=18638, but I'm not trying to interpolate probable registration timings on users.  In practice we're talking about a difference of seconds, so I haven't bothered with the extra work.  

I'm generating a datafile for English now that I should be able to share the the end of the day:

• user_id
• registration_type  (see https://meta.wikimedia.org/wiki/Research:Attached_user and https://meta.wikimedia.org/wiki/Research:Newly_registered_user)
• user_registration (from user table)
• first_edit (lowest timestamp from "revision" and "archive" for user_id)
• registration_approx (my approximation based on the method described above)

-Aaron

On Fri, Feb 14, 2014 at 6:06 AM, Federico Leva (Nemo) <nemowiki@gmail.com> wrote:

Felipe Ortega, 14/02/2014 12:05:

Thanks a lot. Then, I look forward to the confirmation and
implementation of this feature. In case it's better to open a new issue
on bugzilla or any other action on my side (lend a hand with value
reviewing/testing) just let me know.

You could help assess the correctness of and/or code the guesstimate method proposed in https://bugzilla.wikimedia.org/show_bug.cgi?id=18638 , for the script to fill further blanks.

Nemo

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