The three parameters of the GEV distribution are fitted by doing linear regression on log of sequence length.
bg.source
:textual description of where the background distribution is derived from
bg.loc
:linear regression model for estimating the location parameter based on log(L), list of lm objects of PWMs
bg.scale
:linear regression model for estimating the scale parameter based on log(L), list of lm objects of PWMs
bg.shape
:linear regression model for estimating the shape parameter based on log(L), list of lm objects of PWMs
pwms
:the pwms for which the background has been compiled
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