When any of the robust statistics are specified on an INSET statement in PROC UNIVARIATE, their values might incorrectly be reported as zero in the inset. This problem occurs only when the ROBUSTSCALE option is omitted from the PROC UNIVARIATE statement, when there is no OUTPUT statement, or if no robust statistics are specified on an OUTPUT statement. The incorrect zero values will appear in plots generated by the HISTOGRAM, PROBPLOT and QQPLOT statements. The robust statistic keywords on the INSET statement are:

GINI MAD QN SN STD_GINI STD_MAD STD_QN STD_QRANGE STD_SN

To circumvent the problem, add an OUTPUT statement and output any one of the robust statistics, or add the ROBUSTSCALE option the PROC UNIVARIATE statement.