Thesis (BS Applied Mathematics) -- University of the Philippines Mindanao, 2004

The Philippine eagles (Pithecophaga jefferyi) are monomorphic species; that is, it is difficult to distinguish between the male and the female. To determine the sexes of the eagle, a mathematical model was developed using the seven external measurements of thirteen eagles (7 females and 6 males). These measurements include the bill height, bill width, bill core, tarsus length, tarsus d-ventral, tarsus lateral and tarsus circumference. The two approaches that were developed were the cluster analysis, specifically k-means, clustering, and discriminant analysis. Due to the differences in the ages of the eagle, which produced little classification error in cluster analysis, the former, using the tarsus d-ventral, tarsus lateral and tarsus circumference, would be the preferred approach for the sex determination of the Philippine eagles. On the other hand, if provided with similar ages of the eagles, both cluster analysis and determinant analysis could be used to generate sufficient information for the determination of the sex of the Philippine eagles.