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>Thanks to everyone who replied. A few suggested smoothing functions but
>that's not really what I wanted to do. Anyway, I've been given to
>understand that it can be done although possibly not in TS but alas, no
>one could tell me how to do it - at least not for free... (:-)
I can give you some advice for free.
You can often make a curve fit into a linear regression. For example,
if you have exponentially rising data that you suspect is of the form
y=a*exp(mx+b), then you can convert it to a line u=mx+b, where
u=ln(y). Then you find the fit for slope (m) and intercept (b), and
substitute back.
Similarly, if you suspect your data has the form y = sin(p(x+b)),
you can invert it as u = px+pb where u=arcsin(y), and solve fo the
slope p and intercept pb.
That's my $0.02.
I wouldn't do it for free either, btw.
-Alex
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