I'm posting this message on behalf of my friend.
Any help would be greatly appreciated.
> ---------- Forwarded message ----------
> Date: Fri, 26 Jan 2001 04:15:49 -0800
> From: Renita Glaser <[EMAIL PROTECTED]>
> Subject: t critical: beta (Power ala David Murray)
>
> I am doing a power analysis using the formulas outlined in David Murray's
> book, "Design and Analysis of Group-Randomized Trials." In going through
> example 1 in his chapter on power analysis, I am puzzled about where his
> estimate of tcritical:beta comes from. I understand that you can
> obtain the
> t critical: alpha from a t-distribution table but I am at a loss
> for how to
> obtain t critical:beta. Once I get this value, I can calculate the
> detectable difference with 80% power!
>
> Any help would be greatly appreciated...
>
> Renita
>
>
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