Bootstrap and Cross-Validation Estimates of the Prediction Error for Linear Regression Models

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Abstract
Different estimates of the mean squared error of prediction for linear regression models are derived by the bootstrap and cross-validation approaches. A comparison is made under normal error distributions, especially by the biases and the mean square errors. The results indicate that the bias corrected bootstrap estimator is best unbiased and should be the first choice, while its simulated variant has approximately the same behaviour. On the other hand, if only a comparison between uncorrected estimators is made (with implications for nonlinear regression models in mind), then other variants of bootstrap estimates are preferable for a large or a small dimension of the model parameter. For a small dimension, the cross-validation estimate and sometimes grouped variants of it seem also to be acceptable if the model error is known to be small.

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