#' @param absVal Logical. If TRUE, take the absolute value of values in
#' signal. Choose TRUE if you think there may be some
#' genomic loci in a region set that will increase and others
#' will decrease (if there may be anticorrelation between
#' regions in a region set). Choose FALSE if you expect regions in a
#' given region set to all change in the same direction (all be positively
#' correlated with each other).
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