which model describes the residuals of the linear regression equation? who is the author of the linear regression model why is greene's textbook useful in econometric analysis? why is variable decomposition useful what is the residual variance matrix what is the residual coefficient why do we do a variance commutation what is value of coefficient of variance for linear regression if regression model uses residual variance and coefficients which econometric analysis model is useful? how to find residual variance which of the following is a useful linear regression model? what is residual variance-covariance matrix in regression model how to find the residual variance of a linear regression model. when to use the residual variance-covariance matrix? what is the linear decomposition of a variance why is a linear model useful? what is the residual matrix of a linear regression model which linear model is best for regression what is residual v coefficient