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I using a mixed-effect logistic regression model and I need to do a cross-validation to check the accuracy of my model. I have 20 observations for each individual and 500 individuals in my dataframe.

Can I take, for example, 15 random observations of each indiviual and put this on my train set? And use the rest on the test set?

or can I put individuals that don't appear on the train set on the test set?

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