Stein's Covariance Estimator
Stein/Haff's covariance estimator
Stein/Haff's ordered eigenvalue estimates
Stein's isotonized covariance estimator
Stein's isotonized eigenvalue estimates
Stein's raw (unisotonized) eigenvalue estimates
Estimates a covariance matrix using Stein's isotonized covariance estimator, or a related estimator suggested by Haff.