How to predict furure values in a non linear regression?

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FEDERICO CIOL on 24 May 2021
Commented: Torsten on 24 May 2021
Hi, I have a set of data and using the cftool I create a fitting curve of third order.
Now I want to predict future data using this fitting curve but I don't have any idea to do this.
  1 Comment
KSSV on 24 May 2021
future data? Do this future data lie in the intervel of input?

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Answers (1)

Torsten on 24 May 2021
Edited: Torsten on 24 May 2021
Naive procedure:
If your fitting curve depends on time t, evaluate it at the future time instant you have in mind.
But be very,very careful here:
Extrapolation of trend curves is extremely error-prone. Especially polynomial curves of degree greater 1 usually don't reflect the physical or economical background where the data stem from and are therefor only suited to interpolate between the time limits of your data.
Torsten on 24 May 2021
Didn't you get a formula for the polynomial p as
p(RMS index) = RMS value
(whatever RMS may mean)

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