I have a dataset which contains a categorical outcome, 2 repeated measures over time for the same subject and several covariates

dummy_data = data.frame(ID = seq(1,100), Volumes = rnorm(100, 10,20), 
                        factor = rnorm(100, 0, 2), time = rep(c("PRE", "POST"), 50), 
                        dummy_cov1 = rep(sample(LETTERS[1:4], 50, replace= T), each=2), 
                        dummy_cov2 = rep(sample(LETTERS[3:6], 50, replace = T), each=2),
                        outcome = factor(rep(sample(0:6, 50, replace = T),each = 2 )))

I would like to fit a model to predict the outcome according to the factor and volume (which are repeated measures for each individual over time), with other covariates which are constant over time.

I have tried linear mixed models using ID as random effects and time as a covariate, but I obtain errors of convergence.

What do you think is the best approach to analyze this dataset?



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