Confidence Intervals

We often quote confidence intervals for a parameter, the SAS procedure is PROC MEANS.

The format of PROC GPLOT is,

PROC MEANS data=library.datafile lclm uclm alpha=conf level;

VAR the variable(s) to be used;

RUN;

Where lclm and uclm are for lower and upper confidence limits and alpha is the significance level (defalut=0.05).

Example

Suppose you wanted to calculate the 95% confidence interval for price, the program you would write is,

PROC MEANS data=sasuser.houses lclm uclm alpha=0.05;

VAR price;

RUN;

SAS will output sonething similar to this,