This function provides a measure of the relative standing of a value within a data set.
If the value whose percent rank is being determined, x, is one of the input values, then the return value is computed by:
Otherwise, interpolation is used to combine the percent ranks for the closest data points on either size of x.
If the input values are viewed as a sample from some distribution, then PercentRank can be viewed as a smooth estimate of the empirical cumulative distribution function.
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