Thank you for your answer, and how to use it with GML.
As you see from my plot from Wednesday last week, I had some implementation too.
(I did not make a literature search, Young's paper, which I quoted, is one out of (possibly) many, and probably several possible approximate formulae exist; so it is not clear to me, which paper/approximation/formula to use, e.g., STDP or STDI, or use other definitions of n_i etc.?)
My original intention by the click on the button "software suggestion" on the SAS-webside was, that I thought that SAS could implement a "reference TI for regression" like they have for "TI of samples" in PROC CAPABILITY.
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