Thanks for the input! Rounding doesn't solve the issue unfortunately.   For the second dummy value in the example code, using anything less than 3.1934 will lead into the floating point overflow error.   So for example, this works just fine, creating the below output:   data check; AVAL=10.4; output; AVAL=3.1934; *Works on AVAL=5 or if AVAL>=3.1934; output; run; proc ttest data=check dist=lognormal; var aval; ods output ConfLimits=_COUNT_STAT_GEOMM_00(rename=(GeomMean=GEOMM CV=GCV)); run;   Probably the issue is that the confidence interval for the CV becomes too large when the second dummy value is less than 3.1934. But I still need to calculate the Geometric mean with the original example values, so is there any way to disable the confidence limits from this procedure, as I don't even need them? ... View more