[R] where are my pspline knots?

[Federico Calboli]

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.

Best,

Federico

--
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