- Previously, when fitting a model with empirical covariance matrix estimation to a data set with a large number of subjects and/or a large number of coefficients, the model fitting could take very long and exhaust the memory in the worst case. This was due to an inefficient implementation of a matrix needed only in case of Satterthwaite degrees of freedom adjustment. This is fixed now, by returning the matrix `empirical_g_mat` in the `mmrm` object, instead of the previous `empirical_df_mat` matrix. The model fit is now much faster and does not exhaust the memory anymore. If old model fit objects are used, the `empirical_df_mat` will still be used correctly, however a deprecation warning will be issued. Please consider re-fitting the model to get the new `empirical_g_mat` matrix.
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