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st: equivalence tests
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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