This standard stuff in any course in linar models.
Attend one.
Bendix Carstensen
> -----Original Message-----
> From: A UK-based worldwide e-mail broadcast system mailing
> list [mailto:[log in to unmask]] On Behalf Of Raphael Fraser
> Sent: Friday, October 28, 2005 10:44 PM
> To: [log in to unmask]
> Subject: QUERY: Standard Error for Hazard Ratio in Survival Analysis
>
>
> Dear All,
>
> I would like to calculate the standard error (s.e.) for the
> Hazard Ratios (HR) involving an interaction term. I have the
> following model: HR =exp(b1x+b2y+b3z+b4x*y). All variables
> being continuous. I would like to fix x at 1 (i.e. x=1) while
> holding all other variables constant. That is,
> HR=exp(b1+b4y). Then calculate HRs at specific values of y.
> My problem is calculating the Standard Error for these hazard
> ratios so I can calculate the confidence intervals. I know
> how to calculate the variance-covariance matrix for the model
> but I am not quiet sure how to cal s.e. for the above HRs.
> Can anyone help? References to journal article would also be helpful.
>
> Raphael
>
|