a question about confidengce interval

liiiiiiiib — Fri, 22 Oct 2021 05:53:29 GMT

Hello, I am a novice in SAS analysis. When using SAS to analyze complex sampling data, I found that when some proportions are small or large, the confidence interval is less than 0 or greater than 1, which is obviously impossible. Below is my code. What can I do to solve it? Drcat is a binary variable. I want to count its prevalence and confidence interval in the target population.

thank you !!!!!!!!!!!!

proc surveymeans data=allcomcat99 nomcar VARMETHOD=TAYLOR ;
stratum sdmvstra;cluster sdmvpsu; class agegroup;
var drcat;
domain sub sel;
weight wtmec2yr;
title "dr prevanlence";
run;

Re: a question about confidengce interval

PaigeMiller — Fri, 22 Oct 2021 10:46:08 GMT

Means are continuous and scaled between negative infinity and positive infinity. There's no reason a mean (or a confidence interval for a mean) can't be less than zero.

Proportions are continuous but scaled between 0 and 1. Proportions (and confidence intervals for proportions) cannot be less than 0. You want to have SAS compute proportions, not means. To compute proportions, use PROC SURVEYFREQ.

topic Re: a question about confidengce interval in Statistical Procedures

a question about confidengce interval

Re: a question about confidengce interval