[R] R setting number of knots in smoothing splines

[Duncan Murdoch]

On 13/11/2015 2:34 PM, writetohana at gmail.com wrote:
> Dear all,
>
>
> I am solving a problem about setting a knots in function smooth. spline. I am not very sure how to set a knot points in this. I understand it accept only number of points, but not distances between them. Can you help me how to specify the distances?

smooth.spline (you really shouldn't be using HTML to post; then the 
function name wouldn't get messed up) chooses evenly spaced quantiles in 
x for the knots.  Normally the result if you choose every unique x won't 
be much different:  it's the "df" or "spar" parameter that controls the 
result much more than the knots.

So I'd say you should read more about smoothing splines before you 
continue with your approach.

Duncan Murdoch



>
>
> Thanks a lot.
>
> Regards!
> 	[[alternative HTML version deleted]]
>
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