I have been trying to run a model when checking the assumptions. It is a univariate analysis with an ordinal variable with two thresholds, and I have two covariates.
Everything seems to be fine, but I get this error message:
Error: In model 'base' the thresholds in column 'BFEED12th_01' of matrix/algebra 'fMZ.expThreshfMZ' contain NA values. Only the first 2 elements of this column are inspected.
Do you know what may be happening?