The SURVEYMEANS Procedure |
Variance and Standard Deviation of the Total
When you specify the keyword STD or the keyword SUM, the procedure estimates the standard deviation of the total. The keyword VARSUM requests the variance of the total.
Taylor Series Method
When you use VARMETHOD=TAYLOR, or by default, PROC SURVEYMEANS uses the Taylor series method to estimate the variance of the total as
where if
,
and if
,
Standard Deviation
The standard deviation of the total equals
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