Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: RRR with CI from logit model


From   Michael Ingre <[email protected]>
To   [email protected]
Subject   Re: st: RRR with CI from logit model
Date   Mon, 1 Nov 2004 15:54:01 +0100

A follow up on statistical power.

I have calculated a few RRRs and an interesting pattern is emerging. Extreme comparisons give insignificant p-values but others don't.

RRR for 9.5 vs 1, p=.669
RRR for 9.5 vs 9, p=.030
RRR for 2 vs 1, p=.049

Predicted absolute probabilities are: 9.5=.33 , 9=.14, 2=.000020 & 1=.000015

What is going on here? Am I doing something wrong? I appreciate any suggestion because this makes no sense to me.


Michael


nlcom exp(81 * squared + 9 * linear + constant) /              ///
         (1 + exp(81 * squared + 9 * linear + constant)) /    ///
      exp(4 * squared + 2 * linear + constant) /            ///
	     (1 + exp(4 * squared + 2 * linear + constant))



*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index