How to predict furure values in a non linear regression?

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FEDERICO CIOL 2021-5-24

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评论： Torsten 2021-5-24

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 2021-5-24

future data? Do this future data lie in the intervel of input?

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Answer 1

Torsten 2021-5-24

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编辑：Torsten 2021-5-24

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.