How to fix Error for Repeated Measures Model.fit: The between-subjects design must have full column rank.

Hello,

I was wondering how to fix for this error:

Error using RepeatedMeasuresModel.fit (line 1346)
The between-subjects design must have full column rank.

Error in fitrm (line 77)
s = RepeatedMeasuresModel.fit(ds,model,varargin{:});

Error in Ranova_3_ON (line 40)
rm = fitrm(t,'Center-Edge ~ Type + TumorNumber +  TumorColor + TumorStiffness + TumorBorder +
BrainVolRemoved + TumVolRemoved + BloodLoss', 'WithinDesign',Region);

My variables are all independent, but I don't know how to make matlab understand that. I included a sample of what my table looks like as a screenshot, and this is my code for making the fit repeated measures table model (in order to run a ranova):

rm = fitrm(t,'Center-Edge ~ Type + TumorNumber +  TumorColor + TumorStiffness + TumorBorder + BrainVolRemoved + TumVolRemoved + BloodLoss', 'WithinDesign', Region);

Thank you!

Answer 1

[Coren Pulleyblank]

I have been struggling with this error message as well and I'm new to MATLAB and these statistical measures. For starters I was only testing 1 response variable over 5 timepoints and 5 treatments. For some reason the problem seemed to be fixed when I changed my input table to have the treatments input as text rather than categorical data. Not sure if this might help anyone else.