A translation would help. But even just the raw numbers should be understandable, no? Either way, we'd appreciate any information you can give us.
OK, I post it here, please feel free to move to an appropriate place.
For the record, the whole discussion (in Russian): ru:Википедия:Обсуждение правил/Запрет на создание новых статей анонимными участниками. The statistics are summarized in the preamble.
Statistics 1: ru:Участник:Skydrinker/Анонимы и новые статьи. Summary: User Skydrinker monitored over the weekend 12/13.01.10 newly created articles (six times, different times of the day). In total, he looked at 300 articles; of these 300, 72 articles were created by unregistered users (24%). Out of these 72, 61 (84.7%) were speedy deletion material. To be precise, 8 - nonsense, 6 - empty, 19 - copyvio, 7 - obvious vandalism, 12 - not notable, 7 - spam or ads, 2 - not in Russian. Eventually, 6 out of these 61 have been improved by experienced users; 3 speedy deletion reviews were contested and sent to usual deletion review. Another 11 (=72 - 61) articles did not qualify for speedy deletion and eventually have been improved as a part of regular flagged revision procedure.
(to be continued)
Statistics 2: ru:Участник:Шуфель/Статистика (новых статей). 460 articles created in the period 22.12.09-31.12.09 have been monitored. Eventually, 122 articles have been deleted (8 be deletion review, others by speedy deletion process). Here is the summary:
|user class||articles created||% of total||deleted||% of created||flagged||%(flagged/all)|
|Total||460||100 %||122||27 %||268||79 %|
The conclusion is that the quality of articles created by unregistered users is virtually the same as the quality of articles created by non-autoconfirmed users.