Message-ID: <CAO-mjT_bfndYXEtPXvzOiemwfz11rfvTDHaHNRvsAgNWbOAiJQ@mail.gmail.com>
Date: 2013-03-12T19:59:35Z
From: Rajat Tayal
Subject: Extracting the knots of a natural cubic spline fit
Dear list members,
I am trying to fit a natural cubic spline to my dataset using the ns
function in the splines package.
Specifically, I do:
library(splines)
lm(y ~ ns(x, df=3), data =data)
How do I extract the values of the interior knots of the fitted spline ?
Thanks,
Rajat
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Rajat Tayal
Ph.D Research Scholar
Indira Gandhi Institute of Development Research,
Gen A.K.Vaidya Marg, Goregaon (East)
Mumbai