| Summary: | 碩士 === 國立東華大學 === 應用數學系 === 92 ===
Boosting is one of the successful ensemble classifiers. It attracts much attention
recently because its impressive empirical performances and less understood
theoretical properties. In this study, we consider the issue of variable selection
under the boosting scheme. We study the effectiveness of principle component analysis (PCA),
the significance-based selection method and their hybrids as methods of selection.
Under multivariate normal model, we found that PCA-SIG (PCA then Significance-based) methods
outperform PCA methods and are comparable with SIG-PCA methods.
Similar yet more marked phenomena are observed for NBA 2002-2003
(Spurs vs. Nets) box-score data analysis. Using the box-scores from
'Spurs-like' and 'Nets-like' teams, we consider the winner prediction
as a (supervised) learning problem. We note that boosting with PCA-SIG achieves satisfactory
error rates and outperforms other methods.
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