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Re: st: RRR with CI from logit model
On 2004-11-01, at 10.41, maartenbuis wrote:
Thanks Maarten. Your suggestion seems to do the trick:
Second, you can confidense intervals of relative risk
ratios with -nlcom-.
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))
The above code gives the expected RRR for 9 vs. 2 on the scale.
However, I was a bit disappointed with the statistical power. A linear
combination (-lincom-) for the odds ratio was significant with p=.007
but the RRR was far from significant with p=.666.
I guess this is one reason why RRRs are seldom reported with this kind
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