The reliability of Wikipedia (primarily of the English-language edition), compared to other encyclopedias and more specialized sources, has been assessed in many ways, including statistically, through comparative review, analysis of the historical patterns, and strengths and weaknesses inherent in the editing process unique to Wikipedia. Recent incidents of conflicted editing, and the use of Wikipedia for 'revenge editing' (inserting false, defamatory or biased statements into biographies) have attracted frequent publicity.