is covariance always symmetric in a sample? is a sample covariance matrix always symmetrical or positive definite? is a covariance matrix symmetric is a covariance matrix always positive and symmetric is a sample covariance matrix always positive is the covariance matrix always symmetric and positive-definite what makes a covariance matrix symmetric is a sample covariance matrix always positive-definite are samples always always symmetric and definite is a sample covariance matrix always positive definite is covariance matrix always symmetric is an observation matrix always symmetric are covariance matrix always positive-definite a sample is always positive definite is a sample covariance matrix always the same is a sample covariance matrix always symmetric is covariance symmetric is a sample covariance matrix always symmetric and positive-definite is the covariance matrix always positive-definite when a sample of observation vectors is always symmetric, the matrix is always positive, and the matrix is always definite, and which is always the best measure of symmetric asymmetry?