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Is there some kind of statistics on the questions/answers/user accounts removal on StackOverflow?

As a researcher I would like to consider the StackOverflow data dump as a representation of the activity of the StackOverflow participants. However, the fact that questions/answers/accounts can be deleted means that this representation is incomplete. While incompleteness is -as such- not a new issue on its own, it would be great to have an estimate of how incomplete is the data.

(I've checked the Community Statistics discussion from 2011 but it seems that deletion was not considered when not related to migration to other network sites.)

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