[R] proportional test on epicalc library vs. Jerrold H. Zar.

From: José Ignacio Bustos Melo <jbustosm_at_udec.cl>
Date: Mon, 05 May 2008 14:34:33 -0400 (CLT)

Hi everyone,

I'm working with the Epical library, specicatly using the power test in proportions. I think this test is not working like in the book: Biostatistical Analysis (4th Edition): Jerrold H. Zar

In the example 23.25. (I attach this Pic) It's not the same answer. Using the follow command don't give the same answer.

power.for.2p(0.75, 0.50, 50, 45, alpha = 0.05)

with this command the Power = 0.6402. But in the Book we find Power=0.72.

¿what it's the correct answer?...¿Zar or Chongsuvivatwong?

Thank guys!

   O__  ---- José Bustos M.
  c/ /'_ --- Master Apllied Stat Program
 (*) \(*) -- University of Concepción, Chile


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