Basic Examples (1) 

Fit repeated measurements with a patient random intercept using ordinary Wolfram expressions. The synthetic patientData is a smooth deterministic function of time and patient index, so the output is exactly reproducible; the fitted variance components quantify deviation from a linear-in-time model rather than measurement noise:

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Nested and crossed designs (2) 

A list of random specifications adds grouping factors; NestedGrouping makes a clinic/patient hierarchy explicit:

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Crossed subject and item factors use one random specification per grouping variable:

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Generalized and nonlinear models (2) 

Use an explicit response family for events or counts:

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Or give a symbolic nonlinear mean expression and starting values:

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Small-sample inference (1) 

Satterthwaite degrees of freedom for the repeated-measures model:

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Inspect fit["ConvergenceReport"], fit["SingularFit"], fit["Warnings"], the grouping levels, residual structure, and prediction target before interpreting a result.