<P> where H is the hat matrix, or the projection matrix in linear regression . </P> <P> The least - squares regression line is given by </P> <Dl> <Dd> y = a x + b (\ displaystyle y = ax + b), </Dd> </Dl> <Dd> y = a x + b (\ displaystyle y = ax + b), </Dd>

What is residual sum of squares in excel