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Table 1 Simulation results.

From: Purposeful selection of variables in logistic regression

n Purposeful Stepwise Backward Forward
60 5.1 4.5 4.9 9
120 24.2 22.4 22.8 24.2
240 52.6 52.6 52.5 36
360 69.8 69.8 69.8 42.5
480 71.1 71.2 71.1 44.2
600 70.5 70.6 70.5 40.4
  1. Retention of the correct model for purposeful, stepwise, backward, and forward selection methods, with no confounding present.