| cov | Covariance Matrix Calculation for (Potentially Grouped) Data |
| degreesFreedom | Degrees of Freedom of a Covariance Matrix |
| Haff_shrinkage | Haff Shrinkage Precision Estimator |
| pooled_cov | Pooled Covariance Estimator |
| tr | Trace of Matrix |
| tu | Function to be optimized for Haff Shrinkage |
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