Diagnosing extrapolation: tree-based density estimation
Proceedings of the tenth ACM SIGKDD international conference on Knowledge discovery and data mining
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This paper considers a problem of jointly estimating a regression function and the distribution of residuals when both are specified non-parametrically. We present a joint penalized optimization criterion that combines log-spline density estimation with spline-based regression methods. We also examine the use of boosting methodology to estimate a regression function over a high dimensional covariate space. We demonstrate that our method has a robustification effect, and show its usefulness in diagnosing problems in data. We illustrate our methods with practical examples when likelihood is an appropriate evaluation criterion.