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June 21st, 2009, 11:36 PM   #1
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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
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June 24th, 2009, 10:49 PM   #2
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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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