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How well (in time) did Wikipedia's users predict its 5 millionth article in English?

Current forecast: Between 4 and 7 days (27% chance3%)
Combining all predictions, the current most likely outcome is Between 4 and 7 days with a probability of 27% (down 3% in last 1 day)

Wikipedia is, according to its site, "the free encyclopedia that anyone can edit". It began in 2001, and has grown ever since. English Wikipedia reached 1 million articles in 2006 and 2 million articles in 2007. Its most recent milestone was reaching 2.5 million articles on August 11, 2008 at approximately 22:29 UTC. As of today, it has 2,644,966 articles.

Wikipedia created a pool asking its users to predict when it would reach 5 million articles. The pool was closed when Wikipdia reached 2.5 million articles.

Previous pools had extremely accurate predictions. The 666,666th, millionth and two-millionth articles had a winning prediction the date of the feat. The winning prediction on article 500,000 was off by one day.

With a longer suspend time, predictions are spread out more than the previous pools. The pool is shown here: http://en.wikipedia.org/wiki/Wikipedia:Five-million_pool
I expect that Wikipedia's average new article creation increases to about 2,000 articles per day. At that rate, the 5 millionth article should be created in late February 2012. However, most predictions are somewhat earlier.

Additional information:
http://meta.wikimedia.org/wiki/Wikimedia_News#Wikipedias


Settlement details: As shown on en.wikipedia.org. This market will suspend when Wikipedia has 4,990,000 articles. If the winning Prediction does not specify a time, the time will be assumed to be 12:00 UTC.

 
Forecast history, %
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Make your prediction!

Same day
9%
Between 1 and 3 days
23%
Between 4 and 7 days
27%
Between 8 and 14 days
23%
15 days or more
19%
Activity: H$500
Question suspends in 3 years

Suspend date: Sun 19th Feb 2012 4pm PST (3 years to go)

Initial likelihoods: Same day: 10%, Between 1 and 3 days: 25%, Between 4 and 7 days: 30%, Between 8 and 14 days: 25%, 15 days or more: 10%

Action history:

Created Wed 3rd Dec 2008 4:44pm PST by onedave[Power User]

Suspend date: Sun 19th Feb 2012 4pm PST (3 years to go)
more info...

 

Predictions (1)

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Comments (1)

  1 onedave[Power User]
Clarification: Take the winning Wikipedia prediction time and subtract the time that the 5 millionth article will be created. The number of days is the winning prediction for this Hubdub market.

This market will likely suspend much earlier that February 19, 2012.
posted 5 weeks ago

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