I can't see a reason for the data to not be available; the deficiencies were (iirc) pre-2004-ish. It's actually really trivial to tell when they started, because the "guesstimates" are the timestamp of the first revision associated with the user. So I'm not sure that this was a deliberate design decision - and if it was, I can't imagine they'd nullify the entire field just because of some inaccuracies a decade ago ;p. On 13 February 2014 09:13, Felipe Ortega <glimmer_phoenix(a)yahoo.es> wrote: -- Oliver Keyes Product Analyst Wikimedia Foundation

Felipe Ortega <glimmer_phoenix(a)yahoo.es> wrote: What "feature" do you mean? Tim

Hey folks, I replied to all of the lists with the email below from my personal address. Turns out that I didn't sign up for analytics-l with that address so I'm sending again. Sorry for the duplicates. ---- 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(a)gmail.com>wrote;wrote: