(1-2*alpha) CI [RSABE / ABEL]

posted by d_labes  – Berlin, Germany, 2016-12-21 12:15 (2681 d 17:31 ago) – Posting: # 16870
Views: 4,876

Dear BE-prof!

❝ Which R script should be used to assess BE in 92.18% CI?:confused:

Which script do you use until now?
A serious script should IMHO not have a hard coded alpha=0.05 or the other way round a hard coded 90% CI. But rather allow the specification of the alpha to use.

Have a look into the function CI.BE() of the package PowerTOST.
For a 92.18% CI specify alpha=(1-0.9218)/2=0.0391, give the point estimate, CV and number of subjects in your study and voila you get the 1-2*alpha CI.
Example:
CI.BE(alpha=(1-0.9218)/2, pe=1.1557, CV=0.3567, n=24, design="2x2")
    lower     upper
0.9609407 1.3899323

Now compare this to the (widened) acceptance range to judge BE or not BE.

❝ Afaik, "classic" BE is analysed in 90% CI. Correct? ;-)

Correct. alpha=0.05.

Regards,

Detlew

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