1. A computer-implemented method comprising: determining a first measure of a first corpus for a search query as a count of times the search query was submitted to search the first corpus in view of a count of times other queries were submitted to search the first corpus; determining a second measure of a second corpus for the search query as a count of times the search query was submitted to search the second corpus in view of a count of times other queries were submitted to search the second corpus; determining a click measure based on a count of selections of first corpus search results for the search query relative to a count of selections of second corpus search results for the search query; determining a measure of relative relevance of the first corpus and the second corpus for the search query based on the first measure, the second measure and the click measure; and providing the measure of relative relevance to a ranking engine for ranking of search results for a search corresponding to the search query.
1. A computer-implemented method comprising: determining a first measure of a first corpus for a search query as a count of times the search query was submitted to search the first corpus in view of a count of times other queries were submitted to search the first corpus; determining a second measure of a second corpus for the search query as a count of times the search query was submitted to search the second corpus in view of a count of times other queries were submitted to search the second corpus; determining a click measure based on a count of selections of first corpus search results for the search query relative to a count of selections of second corpus search results for the search query; determining a measure of relative relevance of the first corpus and the second corpus for the search query based on the first measure, the second measure and the click measure; and providing the measure of relative relevance to a ranking engine for ranking of search results for a search corresponding to the search query. 4. The method of claim 1 wherein determining the measure of relative relevance of the first corpus and the second corpus for the search query comprises determining the first measure of the first corpus as compared to the second measure of the second corpus.