Can anyone give me a clear example of what a "monotonic nonlinear trend" is? I am trying to teach myself time series analysis and ran across this phrase. I know what a nonlinear trend looks like but what is a monotonous one? How does it differ from a non-monotonous nonlinear trend?
example of monotonic nonlinear trend
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1 Answers
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A monotone trend would be one that is either increasing, like this:
or decreasing, like this:
The trend below is not monotone.
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0@Eric I graphed these functions in Maple 16; they are combinations of polynomial and trig functions picked for illustrative value. – 2013-01-02