topic Re: CIs for categorical variables with more than two categories in New SAS User

CIs for categorical variables with more than two categories

K_S — Tue, 09 Jul 2019 13:29:25 GMT

Hi there,

I have several categorical variables with multiple categories.

For example: has disease x, doesn't have disease x, unknown

I want to get the percentage (prevalence) of each with 95% CIs around the estimates. How do I go about doing this?

Thanks!

FreelanceReinh — Tue, 09 Jul 2019 14:18:58 GMT

I remember that this topic was discussed here in 2016: 95% CI for Categorical Variables.

In 2017, Rick Wicklin published an even more comprehensive blog post about these confidence intervals: Simultaneous confidence intervals for multinomial proportions.

Reeza — Tue, 09 Jul 2019 14:20:04 GMT

Each is a proportion, just use the normal approximation to normal (assuming N is large enough) and get a CI that way? You may want a correction factor if you want to limit it to 0 to 100%.

https://documentation.sas.com/?docsetId=statug&docsetTarget=statug_freq_examples04.htm&docsetVersion=15.1&locale=en