"jackson marshmallow" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> > I have series X and series Y. Let Yn = f(Xn). The hypothesis I want to
>  test
> > is that f is a monotonic function.
> 
> Or, rather, that there exists a monotonic function f such that Yn = f(Xn).

Are you saying that if there were one reversal in the Yn
when sorted into the order of the Xn, that would mean that
f was not monotone?
.
.
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