1980 Volume 7 Issue 8 Pages 1-13
To construct the discriminant function for the diagnosis of CPD, the equality of the two covariance matrices were studied. Two were different significantly, which means the use of linear discriminant function for this case is not reasonable. According to the above conclusion, the quadratic discriminant function with 18 variables were derived and ratios of correct diagnosis were compared. Ratios of correct diagnosis by the former are 84% in the CPD group and 97% in the non-CPD group respectively in comparison with 74% and 82% by the latter. By the random number simulation, the quadratic discriminant function turned out to be unexpectedly stable. Our CPD diagnosis system with the quadratic discriminant function by means of on-line computer is mentioned.
