My Math Forum inverse proportion

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 June 21st, 2009, 11:36 PM #1 Newbie   Joined: Jun 2009 Posts: 1 Thanks: 0 inverse proportion hi, in information retrieval course , I had question that I do not understand, it is related to math so hope you can help me question : Which factors of the following inversely proportion to the precision measures? a) not retrieved and relevant + retrieved and not relevant b) retrieved and relevant +not retrieved and not relevant c) retrieved and relevant + retrieved and not relevant the answer is c (Note :i am not sure if + means addition or and ) instructor said you can know the answer by the equation of precision precision= number of relevant document retrieved/total number of document retrieved can any one explain it to me . I hope this is right section to ask this question , i am sorry if it is not Thank you
 June 24th, 2009, 10:49 PM #2 Global Moderator   Joined: Dec 2006 Posts: 18,841 Thanks: 1564 The question doesn't make sense, and neither does the instructor's answer! Choices (a) and (b) are no-hopers. Regarding choice (c), (retrieved and not relevant)/(retrieved and relevant) = (total retrieved - (retrieved and relevant))/(retrieved and relevant) = 1/precision - 1, but I don't think it's reasonable to refer to 1/precision as a factor of 1/precision - 1.

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