If there are any missing values for the analysis variable in PROC UNIVARIATE, the plots generated by the PROBPLOT and QQPLOT statements will be incorrect. Only the location of the plotted symbols will be incorrect. Note that all of the statistics are correct.

To circumvent this problem, omit the missing values using a WHERE statement. However, this will also eliminate the Missing Values section of the output. If this information is needed, then run the PROC UNIVARIATE twice, once omitting the missing values and once without omitting them.

If SAS/QC is available, the problem may also be circumvented by using PROC CAPABILITY.