If the parameter estimation routine fails to converge for any parametric distribution specified on the HISTOGRAM statement in PROC UNIVARIATE, and an INSET statement specifies any of the parameters for display on the graph, the resulting graph might display invalid parameter estimates instead of missing values. The log will correctly include a message indicating failed convergence, such as

NOTE: The beta curve was not drawn because an estimate of sigma could not be computed.

The printed output and ODS output data set PARAMETERESTIMATES are both correct and will not contain parameter estimates.

If SAS/QC is available, PROC CAPABILTY can be used instead of PROC UNIVARIATE as a circumvention.