## intra-subject variability from CI [General Sta­tis­tics]

Dear shawn,

❝ From the forum, I found the way to calculate intra-subject variability from confidence interval.

Fine for you. If you are interested in a software for doing this, habe a look into R package PowerTOST / function CI2CV().

❝ I am wondering how I cite this calculation or anyone can tell me where this calculation originate from?

This is a little bit algebra based on the formula of the CI. I don't think that there is a paper dealing with this algebra. I further think there is no need to have a citation for that.

IIRC the little algebra was first mentioned in Helmut's lecture for the conference on "Bioequivalence and Bioavailability" Budapest 2009.

Regards,

Detlew