The desired probability interval, in the range(0, 1)
Value
A list where each element is one of the contiguous sets making up the HDR
Details
The output of this function is a list of contiguous ranges which cover the probability interval requested. A highest density region might have multiple such ranges if the calibrated date is multi-modal. These differ from credible intervals, which are always contiguous but will not be a good representation of a multi-modal probability distribution.