Table 7 : Forward selection method for Discriminant analysis model with
selected independent variables and results of serum HBs Antigen test as
the dependent variables.


Selected independent variables Coefficients used in the discriminant equation

Age group (coded as 1 for <5 yrs, 2 for 5-14 yrs,                    3 for 15-44 yrs and 4 for 45+ yrs) 1.299
(Constant) -2.985

  Discriminant score at group centroids

Negative HBs Antigen -0.022
Positive HBs Antigen 0.636
Critical value 0.307

P (model)<0.001 Discriminant score (D) = -2.985 + [1.299 x Age group (coded as
1 for <5 yrs, 2 for 5-14 yrs, 3 for 15-44 yrs and 4 for 45+ yrs)]
Prediction accuracy for negative test results=100%
Prediction accuracy for Positive test results= 0%
Overall prediction accuracy=96.7%

Khaleel et al.Epidemiology Reports  2013 1:1DOI : 10.7243/2054-9911-1-1