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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: Psychopharmacology (Berl). 2018 Sep 14;236(1):99–110. doi: 10.1007/s00213-018-5005-6

Figure 4.

Figure 4.

Mean squared error for the training sample and the inner and outer cross-validation as a function of the number of predictors. It is apparent that as the number of predictors increase from 1 to 2, the standard error of estimate decreases for our training sample and the inner cross-validation (CV Holdout); however, under the same circumstances, the standard error of estimate increases for the outer-cross validation (Test Holdout)