Re: [R] Survival dummy variables and some questions

From: Stephen <szlevine_at_nana.co.il>
Date: Tue 19 Jul 2005 - 16:59:05 EST

Many thanks I follow you what you say.... You can request predicted values at any sequence of ages - I guess there are plenty of postings on how to do that .... Regards, Stephen ----- Original Message ----- From: "Frank E Harrell Jr" To: "Stephen" Cc: "Prof Brian Ripley" ; Sent: Monday, July 18, 2005 6:13 PM Subject: Re: [R] Survival dummy variables and some questions > Stephen wrote: >> Hi 1. Right perhaps this should clarify. I would like to extract >> coefficeints for different levels of the IVs (covariate). So for >> instance, age of onset I would want Hazards etc for every 5 years and so >> on... The approach I took was to categorize the variables (e.g., age of >> onset) and then turn the resultant categorical variable into a factor as >> opposed to a variable... that is when the problems began.... An >> alternative approach to pulling out different values at different levels >> of the variable is what I seek. 2. I looked for the link, but can't > > Your needs don't require categorization. You can request predicted values > at any sequence of ages. If you want hazard ratios you can take > differences in predicted log hazards and antilog them. > > Frank > > >
-- > Frank E Harrell Jr Professor and Chair School of Medicine >
Department of Biostatistics Vanderbilt University >

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