Confidence interva width

[Theresa Pfu]

Hi,

I'm desiging a study with the primary objectives of assessing sensitivity and specificity of a diagnostic test.
We have a certain sample size available and I would like to calculate a confidence interval width for a few anticipated sensitivity and specificty values (in %) given our sample size.
Which command can I use for this?
I was looking into ciwidth , however for this I can only find method mean or variance, whereas I would be working with proportions.

Appreciate any guidance,
Thanks
Theresa

[Clyde Schechter]

-ci proportions- (or -cii proportions-) will calculate confidence intervals for you. It will not calculate the width of the interval. But you can do that yourself following the command with

local width = r(ub)-r(lb)

Read -help ci- to figure out whether you need -ci- or -cii-. It depends on what kind of data you are starting with.

[Theresa Pfu]

that did the job thank you!