repeated-measures ANCOVA: How to perform the analysis when the parallel slope assumpt. doesn't meet?

Reinaldo — Mon, 18 Jun 2018 19:35:14 GMT

Hi all,

I need to perform the ANCOVA for a repeated-measures design.

I tried to adapt the Julian's ANCOVA procedure showed on the https://www.youtube.com/watch?v=mApbp1RDy-U to my study case (repeated-measures design). Initially, I did the following actions:

1. In the Fit Y by X dialogue: I selected VAR_Y as "Y, Response" and VAR_X as "X, Factor";

2. For "Group by" I selected the variable Timepoint;

3. Density Ellipse: I selected .50;

4. Then I clicked on "Fit Line".

JMP plotted a line for each timepoint and some of them crossed other lines. So, the parallel slope assumption did not met. So, how can I handle with it and perform the ANCOVA?

Thank you!

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repeated-measures ANCOVA: How to perform the analysis when the parallel slope assumpt. doesn't meet?