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Re: st: Question about Baseline Hazard in Parametric Hazard Models
From
Steven Samuels <[email protected]>
To
[email protected]
Subject
Re: st: Question about Baseline Hazard in Parametric Hazard Models
Date
Mon, 8 Nov 2010 20:23:43 -0500
---
Two suggestions: 1) -stpm2- from SSC, which uses restricted cubic
splines; and 2) -stcox-, followed by -stcurve-, which will smooth the
Cox baseline hazard. I recommend against third degree polynomials,
because they can curve up or down at the ends unpredictably and
implausibly.
Steve
Steven J. Samuels
[email protected]
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax: 206-202-4783
On Nov 8, 2010, at 5:33 PM, Irwin T.S. Wang wrote:
Dear All,
I would like to specify/estimate a baseline hazard function, which is
not among the distribution provided by Stata, e.g. exponential,
Gompertz, in a Proportional Hazard (PH) models. For example, I want to
restrict the shape of the the baseline hazard to a third degree
polynomial in time, such that
Lamda0(t) = exp[a0 + b1*(t) + b2*(t^2) + b3*(t^3)]
Can I do that in Stata?
Thank you very much in advance. Any info will be greatly appreciated.
T.S. Wang
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