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

[#1]

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:

1. Y1 has a clear negative trend across the Ordinal X
2. 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

[#2]

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-...