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  "Description": "Covariance is of universal prevalence across various\ndisciplines within statistics. We provide a rich collection of\ngeometric and inferential tools for convenient analysis of\ncovariance structures, topics including distance measures, mean\ncovariance estimator, covariance hypothesis test for one-sample\nand two-sample cases, and covariance estimation. For an\nintroduction to covariance in multivariate statistical\nanalysis, see Schervish (1987) <doi:10.1214/ss/1177013111>.",
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