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st: equivalence tests


From   "Cathy L. Antonakos" <cathya@umich.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: equivalence tests
Date   Tue, 10 Jul 2007 09:04:11 -0400 (EDT)

Celine Genty wrote:

How can I do equivalence tests for means and for proportions ?
There is a message on "Equivalence Testing" in the Stata archive, Jan 14 2004, that mentions problems with -equim- or -equip-. I could not resolve the results in the STB Reprint Vol. 3 pp. 107-112, STB-17, sg21 (R. Goldstein) when I applied formulas from a paper I was given by a client (Hwang, IK & Morikawa T. 1999. Design issues in noninferioirty/equivalence trials. Drug Information Journal, vol. 33, pp. 1205-1218).

I wound up using formulas in Excel based on the Hwang & Morikawa paper (and still had trouble getting reasonable results, possibly based on a narrow equivalence interval, or lack of clarification in the paper).

There is also the Bland & Altman method. The reference is Bland JM, Altman DG. 1986. Statistical methods for assessing agreement between two methods of clinical measurement. Lancet i, 307-310.

Cathy Antonakos
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