-rcspline- is on SSC.
Maarten is right, but his suggestion does not answer all of José Maria's question. A user might reasonably want to see the numerical values.
-rcspline- is not r-class, but the r-class results left behind by -mkspline, cubic- which -rcspline- calls are zapped by other programs -rcspline- calls, and so they are not visible to the user after it has finished.
I'll think about adding something to do this to the program: there are various possibilities. But running -mkspline, cubic- with equivalent options will leave the values in r(knots).
sysuse auto, clear
rcspline mpg weight, showknots
mkspline weight_ = weight, cubic
. mat li r(knots)
r(knots)[1,5]
knot1 knot2 knot3 knot4 knot5
weight 1930 2336.25 3190 3518.75 4130
Nick
[email protected]
Maarten buis
You can specify the -showknots- option. Quoting from the
helpfile of -rcspline:
"-showknots- specifies that the positions of the knots be
shown on the graph by vertical lines."
--- On Mon, 4/5/09, jmpsouza wrote:
> I am not able to get explicitly the knot values and to put
> them in the x axis when using rcspline (a .ado written by
> Nick Cox). For example -rcspline rihoma nd3peso, stub(stub)
> gen(new) sh- gives a nice graph, but does not allow me
> to know and to plot the knots.
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