Calculates the Rank Product from a set of gene rank probabilities
numeric vector of gene rank probabilities
The low level calculation of the RP value, as described in the Rank Product paper by Rainer Breitling. Given an ordering of N genes in a differential expression result, the probability of a gene occuring at position j is given by (j/N). With a set of K replicates, Breitling defines the RP value for a gene as the K'th root of the product of the probabilities from all K replicates.
numeric value of length 1, equivalent to the geometric mean of
log2(x) for numerical stability, and further
normalized by the number of replicates K to allow comparisons
As implemented, it is equivalent to
logmean. Contrast with
Breitling, R. FEBS Letters 573 (2004)
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