[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: equivalence tests

From   "Cathy L. Antonakos" <>
Subject   st: equivalence tests
Date   Sun, 8 Jul 2007 18:17:54 -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. I would take a look at that before using -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). All of this under duress!

There is also the Bland & Altman method (I can't remember why this wasn't a fit for the project I was working on at the time). 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
*   For searches and help try:

© Copyright 1996–2017 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index