to determine the values of
we can calculate the p partial derivatives
and can set each of these derivatives equal to 0
the resulting p equations,which are called the normal equations, well from a set of p linear equations in
we shall assume that the p*p matrix formed by the coefficients of
in the normal equations is nonsingular
then those equations will have a unique solution
will be both the M.L.E. and the lest-squares estimates of