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Original Articles

ENSEMBLING REGRESSION MODELS TO IMPROVE THEIR PREDICTIVITY: A CASE STUDY IN QSAR (QUANTITATIVE STRUCTURE ACTIVITY RELATIONSHIPS) WITH COMPUTATIONAL CHEMOMETRICS

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Pages 261-281 | Published online: 12 Mar 2009

Figures & data

FIGURE 1 The error function for different complexities of the model.

FIGURE 1 The error function for different complexities of the model.

FIGURE 2 Statistical problem.

FIGURE 2 Statistical problem.

FIGURE 3 The computational problem.

FIGURE 3 The computational problem.

FIGURE 4 The representational problem.

FIGURE 4 The representational problem.

TABLE 1 Ecotoxicological Data Required Under 91/414/EEC (Partial List)

APPENDIX A Molecules and Toxicity for Oral Quail. The Elements in Grey Have Been Left Out During Training to be Used as a Test Set for the Ensemble Model

APPENDIX B Names of the Descriptors Computed Through Dragon for the Oral Quail Basic Models

TABLE 2 NN Multilayer Perceptron Model for Oral Quail

TABLE 3 Pace Regression Model for Oral Quail

TABLE 4 Basic Oral Quail Models Considered for Ensembling

TABLE 5 Results for Ensemble 1 Oral Quail

FIGURE 5 REC curves for the Oral Quail on the (a) training set and (b) test set, respectively. We observe that the mean model has a nonconvex behavior and does not reach the accuracy.

FIGURE 5 REC curves for the Oral Quail on the (a) training set and (b) test set, respectively. We observe that the mean model has a nonconvex behavior and does not reach the accuracy.

TABLE 6 Results for Ensemble 2 Oral Quail

FIGURE 6 Regression lines for the second NN model for Oral Quail on the (a) training set and the (b) test set.

FIGURE 6 Regression lines for the second NN model for Oral Quail on the (a) training set and the (b) test set.

FIGURE 7 Comparison of the two NN models for Oral Quail on the (a) training set and (b) the test set.

FIGURE 7 Comparison of the two NN models for Oral Quail on the (a) training set and (b) the test set.

TABLE 7 BASIC Models for Bee

FIGURE 8 REC curves for the training set and test set of the mean model for bee.

FIGURE 8 REC curves for the training set and test set of the mean model for bee.

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