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Cross-Validation

Cross-Validation

Cross-Validation:

Cross-validation is a general computer-intensive approach used in estimating the accuracy of statistical models. The idea of cross-validation is to split the data into N subsets, to put one subset aside, to estimate parameters of the model from the remaining N-1 subsets, and to use the retained subset to estimate the error of the model. Such a process is repeated N times - with each of the N subsets being used as the validation set . Then the values of the errors obtained in such N steps are combined to provide the final estimate of the model error.

The cross-validation is used in various classification and prediction procedures, such as regression analysis , discriminant analysis , neural networks and classification and regression trees (CART) .

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