Editing frequency

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Here's a table of the number of unique users (by ID - so non-public users are all lumped together) editing in some number of calendar months out of a longer period of calendar months. Along the header row are the lengths, in months, of the period being selected from. Down the first column are the number of months being selected. For example, as of end of January 2010, the number of unique user IDs appearing in at least 3 months over the last 6 full months is in the 6th column, 3rd row (8,169); and there were a total of 76,480 unique contributors appearing at least once during the last 12 months.

There's no accounting of the editing period, so if a contributor makes only two edits in the same changeset spanning two calendar months (for example at 23:59 on the last day of the month and 00:00 on the first day of the following month) then they count towards the 2nd row (the ending date of the changeset). Whereas a contributor may edit heavily for four weeks within a single month and only count towards the 1st row.

Number of unique contributors per period length (periods ending in end January 2010)
Frequency of contributions Period length in months
1 2 3 4 5 6 7 8 9 10 11 12
Contributed during at least 1 month 13338 19540 27087 34683 43418 51222 56975 61771 67888 71583 74434 76480
Contributed during at least 2 months 5265 7684 9928 12286 14464 16326 17925 19618 21125 22161 22942
Contributed during at least 3 months 3724 5348 6801 8169 9326 10397 11438 12261 12902 13436
Contributed during at least 4 months 2984 4280 5406 6333 7174 7993 8693 9172 9554
Contributed during at least 5 months 2569 3644 4509 5238 5944 6562 7011 7364
Contributed during at least 6 months 2258 3142 3862 4495 5037 5466 5797
Contributed during at least 7 months 1946 2715 3358 3860 4252 4601
Contributed during at least 8 months 1738 2441 2979 3374 3682
Contributed during at least 9 months 1563 2166 2608 2949
Contributed during at least 10 months 1399 1908 2271
Contributed during at least 11 months 1229 1697
Contributed during at least 12 months 1083