Empirical Performance of Cross-Validation With Oracle Methods in a Genomics Context.
Empirical Performance of Cross-Validation With Oracle Methods in a Genomics Context.
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DOI:
10.1198/tas.2011.11052
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发表时间:
2011-11-01
期刊:
影响因子:
--
通讯作者:
Chatterjee N
中科院分区:
文献类型:
--
作者:
Martinez JG;Carroll RJ;Müller S;Sampson JN;Chatterjee N
When employing model selection methods with oracle properties such as the smoothly clipped absolute deviation (SCAD) and the Adaptive Lasso, it is typical to estimate the smoothing parameter by m-fold cross-validation, for example, m = 10. In problems where the true regression function is sparse and the signals large, such cross-validation typically works well. However, in regression modeling of genomic studies involving Single Nucleotide Polymorphisms (SNP), the true regression functions, while thought to be sparse, do not have large signals. We demonstrate empirically that in such problems, the number of selected variables using SCAD and the Adaptive Lasso, with 10-fold cross-validation, is a random variable that has considerable and surprising variation. Similar remarks apply to non-oracle methods such as the Lasso. Our study strongly questions the suitability of performing only a single run of m-fold cross-validation with any oracle method, and not just the SCAD and Adaptive Lasso.
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