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If I fit the following model to some data

m_splines <- lm(data$y ~ bs(data$x, df = 6))

how do I know how many knots have been used for the cubic spline?

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closed as off-topic by kjetil b halvorsen, Peter Flom Mar 21 at 12:36

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  • $\begingroup$ Did you look at the documentation for bs? $\endgroup$ – The Laconic Mar 21 at 12:09
  • $\begingroup$ I did, but I can't figure out what's the default value for the number of knots. $\endgroup$ – alessandro Mar 21 at 12:11
  • $\begingroup$ just found out that I can use attr(bs(data$x, df = 6),"knots") for the internal knots and attr(bs(data$x, df = 6),"Boundary.knots") for the boundary knots. $\endgroup$ – alessandro Mar 21 at 17:32

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