how to get r variance coefficient what is the variance of a probit graph r covariance matrix what is the matrix of variance for r what is the matrix of variance what is the variance matrix of the probit link function what is the variance of the probit link in r what is r variance and covariance what does a covariance matrix look like r what is covariance matrix what is variance covariance what is the variance variance in r what is the variance matrix for regression what is the variance of the probit coefficient how to find the variance of a probit matrix in r variance coefficient for probit correlation how to find variance matrix what is the variance covariance matrix of a normal regression what is the variance covariance matrix in r variance matrix in r with probit function