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Table 3 Simulation results.

From: Purposeful selection of variables in logistic regression

β 2 n Purposeful Stepwise Backward Forward
0.13 60 9.7 6.3 10.3 10.8
  120 25.8 19.8 24.9 23
  240 55.5 52 54.9 37.4
  360 66.4 65.5 65.8 38.7
  480 72.5 72.7 72.8 41.1
  600 71.4 72.9 72.9 42.9
0.07 60 7.5 3.1 4.4 6.7
  120 18.6 11.3 12.2 15.8
  240 32.2 22.5 22.9 21.4
  360 41.5 35.5 35.5 26.9
  480 47.9 44.5 44.5 34.6
  600 52 50.5 50.5 35.5
  1. Retention of the correct model for purposeful, stepwise, backward, and forward selection methods, for two values of β2 while specifying confounding at 15% and non-candidate inclusion at 0.15.