The SURVEYMEANS Procedure |
Variance and Standard Error of the Mean
When you specify the keyword STDERR, the procedure computes the standard error of the mean. Also, the procedure computes the standard error by default if you specify the keyword MEAN, or if you do not specify any statistic-keywords in the PROC SURVEYMEANS statement. The keyword VAR requests the variance of the mean.
Taylor Series Method
When you use VARMETHOD=TAYLOR, or by default if you do not specify the VARMETHOD= option, PROC SURVEYMEANS uses the Taylor series method to estimate the variance of the mean
. The procedure computes the estimated variance as
where if
,
and if
,
Standard Error
The standard error of the mean is the square root of the estimated variance.
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