The SURVEYMEANS Procedure
If you specify the keyword CV, PROC SURVEYMEANS computes the coefficient of variation, which is the ratio of the standard error of the mean to the estimated mean:
![\[ \mr {cv}(\bar{Y}) = \mbox{StdErr}(\widehat{{\bar{Y}}}) ~ /~ \widehat{{\bar{Y}}} \]](images/statug_surveymeans0071.png){kind=small}
If you specify the keyword CVSUM, PROC SURVEYMEANS computes the coefficient of variation for the estimated total, which is the ratio of the standard deviation of the sum to the estimated total:
![\[ \mr {cv}(Y) = \mbox{Std}(\widehat{Y}) ~ /~ \widehat{Y} \]](images/statug_surveymeans0072.png){kind=small}