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Re: st: Median and CI with predict

From   Carla Guerriero <>
Subject   Re: st: Median and CI with predict
Date   Fri, 7 Feb 2014 16:45:13 +0100

Hi Nick my dependent variable is a proportion (of the budget that
given a budget constraint individuals are willing to give up)
so I used  logit link function to ensure linearity and binomial family
distribution.. For example for 19 in 100 risk reduction I get a
coefficent of -.657211*** and If i use predict the mean WTP is 0.20
which makes sense .. but the SD is 0 .. I want to get CI for the mean
.. maybe boostrapping is an option? I know how to do for DCE where you
have a ratio of the coefficent (delta or boostrapping or parametric
boostrapping) but I have no clue how to make CI for eman WTP estimate
from regression ..

On Fri, Feb 7, 2014 at 4:26 PM, Nick Cox <> wrote:
> -glm- with no covariates gives you confidence intervals for mean
> response, directly or indirectly, depending on the link. No need to
> use -predict- at all. I don't think you can get confidence  intervals
> for the median that way.
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