what is the sample covariance matrix in math when to use covariance matrix how to find a covariance matrix what is sample covariance matrix what is the sample covariance matrix used for what is the sample covariance matrix called what sample of data is a covariance matrix what is the sampling size for covariance how to determine covariance with samples how do you determine if a matrix has covariance when estimating a sample, what is the correct value what is the sample covariance matrix used for what is the sample covariance matrix used for what is the problem with estimating covariance what is the sample covariance matrix what is a covariance matrix in statistics what is the covariance matrix why is a covariance matrix not the correct size? what is the covariance matrix what is the sample covariance matrix