[…] If you do not have SAS/IML software, but you want to compute estimates that are based on a piecewise-linear estimate of the CDF, I suggest you use the PCTLDEF=1 option in PROC UNIVARIATE (or QNTLDEF=1 in PROC MEANS). This produces the Type=4 method in Hyndman and Fan's taxonomy. For more information about the quantile definitions that are natively available in SAS procedures, see "Quantile definitions in SAS." …