why do regression matrices require orthogonality what is orthogonal regression what is orthogonality which of the following is an example of an orthogonal variable? which is true regarding the design of the coefficients for a regressor variable? why are regressor variables orthogonal how does orthogonality affect coefficients what is regressor orthogonality which type of variable has the greatest invariant coefficient when is a coefficient of an uncorrelated variable regressor why is orthogonality important for regression why is the coefficient of an uncorrelated regressor variable invariant do we need orthogonal data which of the following variables must have uncorrelated coefficients? what makes uncorrelated variables orthogonal which variable is orthogonal what is the design of a regression model why regressor vs orthogonal if uncorrelated which variable have an invariant coefficient estimate? which is true of non correlated variables in regression