Is there data or research on how effective suggested answers are in preventing people from asking duplicate questions on online forums and Q&A sites?
While some people make an effort to search, some people will click the "Ask Question" button (or whatever the button name is) and will start typing their question. To deal with this, many forums, including this one, dynamically suggest to users answers which match the subject of their post.
Two specific questions I am trying find some data about are:
What % of people click on such answers (obviously it depends on quality, but some examples would be helpful).
Does it actually stop people from posting their questions (that would probably require an A/B test with two pages, one with auto-suggest on and other with off, so that impact can be attributed only to auto-suggest).
Any other related insights or ideas would be appreciated.