[R] Curve fitting, probably splines

[Greg Snow]

This sounds like possibly using logsplines may be what you want.  See
the 'oldlogspline' function in the 'logspline' package.

On Thu, Apr 12, 2012 at 7:45 AM, Michael Haenlein
<haenlein at escpeurope.eu> wrote:
> Dear all,
>
> This is probably more related to statistics than to [R] but I hope someone
> can give me an idea how to solve it nevertheless:
>
> Assume I have a variable y that is a function of x: y=f(x). I know the
> average value of y for different intervals of x. For example, I know that
> in the interval[0;x1] the average y is y1, in the interval [x1;x2] the
> average y is y2 and so forth.
>
> I would like to find a line of minimum curvature so that the average values
> of y in each interval correspond to y1, y2, ...
>
> My idea was to use (cubic) splines. But the problem I have seems somewhat
> different to what is usually done with splines. As far as I understand it,
> splines help to find a curve that passes a set of given points. But I don't
> have any points, I only have average values of y per interval.
>
> If you have any suggestions on how to solve this, I'd love to hear them.
>
> Thanks very much in advance,
>
> Michael
>
>        [[alternative HTML version deleted]]
>
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-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com