which model describes reasonable estimation of covariance? estimating covariance for a mixed model what is reasonable estimation for the covariance of y. estimate for covariance in mixed models what is a reasonable estimation for the covariance of y what is an appropriate estimation for covariance what is a reasonable estimation for the covariance of y what is a reasonable estimation for covariance in the context of mixed model? what is a reasonable estimation for the covariance of y? what is an estimated covariance what is reasonable estimation of covariance what is the reasonable estimation for the covariance of y what is an estimate of covariance in a mixed model what is the approximate range for the covariance of the mixed model estimating for co-variance what is reasonable estimation for the covariance of y estimate of covariance estimate for covariance when estimating covariance how is estimated the covariance of y