《Table 3–Principle components constructed from the original variables.》

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《"Influencing factors and prediction of ambient Peroxyacetyl nitrate concentration in Beijing,China"》

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The performance indices of the four forecast models are shown in Table 4 to compare the prediction results of the different models.The R-values of the four models were all<0.8，indicating that none of the models was able to completely capture the variation pattern of PAN concentration.However，comparing all four models，the performance indices of Model 3 were superior to those of the other three models，and the prediction results from this model were closer to the actual values.Although Model 4 was also based on an ANN，the model input was chosen as the four principal components，which missed important information，rendering the model's performance even worse than those of Models 1and 2，which were based on the MLR method.