JMP >> ANALYSIS >> TREND TEST for CONTINUOUS Y by ORDINAL X?

Thierry_S — Thu, 31 Aug 2023 17:15:23 GMT

Hi JMP Community,

JMP Pro 16.1, Windows 10 Pro:

I have an apparently trivial question: How can I test for a Trend in Continuous data (Ys) across Ordinal X? I am familiar with the Cochran Trend Test for Ordinal Ys by Nominal X, but I cannot find an equivalent test for my data.

In the mock data, I simulated two behaviors:

Y1 has a clear negative trend across the Ordinal X
Y2 has a weak trend across Ordinal X

I have seen examples where the Ordinal X values are converted to a continuous scale to calculate a linear regression. Still, this approach does not seem appropriate because it implies a linear relationship between X values that may not exist.

Any suggestions are welcome.

Thank you.

Best, TS

Re: JMP >> ANALYSIS >> TREND TEST for CONTINUOUS Y by ORDINAL X?

MRB3855 — Fri, 01 Sep 2023 09:31:17 GMT

Hi @Thierry_S : You may want to consider orthogonal contrasts.

https://community.jmp.com/t5/Discussions/How-to-specify-contrast-coefficients-with-quot-Contrast/td-p/337578

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JMP >> ANALYSIS >> TREND TEST for CONTINUOUS Y by ORDINAL X?

Re: JMP >> ANALYSIS >> TREND TEST for CONTINUOUS Y by ORDINAL X?