How to predict furure values in a non linear regression?

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FEDERICO CIOL
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.
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KSSV
KSSV on 24 May 2021
future data? Do this future data lie in the intervel of input?

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Answers (1)

Torsten
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.
  2 Comments
Torsten
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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