[R] where are my pspline knots?

Federico Calboli f.calboli at imperial.ac.uk
Wed Nov 17 19:05:59 CET 2010

Hi All,

I am trying to figure out how to get the position of the knots in a pspline used in a cox model.

my.model = coxph(Surv(agein, ageout, status) ~ pspline(x), mydata) # x being continuous

How do I find out where the knot of the spline are? I would like to know to figure out how many cases are there between each knot.



Federico C. F. Calboli
Department of Epidemiology and Biostatistics
Imperial College, St. Mary's Campus
Norfolk Place, London W2 1PG

Tel +44 (0)20 75941602   Fax +44 (0)20 75943193

f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com

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