Wikipedia:Wikipedia Signpost/2014-09-24/Recent research

99.25% of Wikipedia birthdates accurate; focused Wikipedians live longer; merging WordNet, Wikipedia and Wiktionary: 0.75% of Wikipedia birthdates are inaccurate, reported Robert Viseur at WikiSym 2014. Those inaccuracies are "low, although higher than the 0.21% observed for the baseline reference sources". Given that biographies represent 15% of English Wikipedia, the third largest category after "arts" and "culture", their accuracy is important.