I always forget the concept of q value.
several month ago I found web site with good explanation of q value. but I cannot remember that site, so in this post I record the track for understanding q value.
how to interpret q value
http://www.nonlinear.com/support/progenesis/samespots/faq/pq-values.aspx
how to calculate q value
http://courses.ttu.edu/isqs6348-westfall/images/6348/BonHolmBenHoch.htm
Minimum FDR for equal to or above given rank among the test set. I think the most concise paper to explan multiple testing correction methods ( bonfferoni, FDR, benyamini-hochiberg and q-value ) is 'multiple testing correction' primer written by Sean Eddy.
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