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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: J Biomed Inform. 2013 Apr 4;46(3):480–496. doi: 10.1016/j.jbi.2013.03.008

Table 4.

Feature selection for simulated dataset 1 using Ordinary LR with FFS algorithm and 5-site EXPLORER with DFFS protocol, where β′ and β″ are model parameters averaged over 30 trials learnt by Ordinary LR and EXPLORER, respectively, the Prob. indicates the chance of a given covariate to be selected by either FFS or DFFS during the 30 trials, and two-sample Z-tests are performed between β′ and β″, which show no differences at all.

True value Ordinary LR EXPLORER two-sample Z-test
β Prob. β Prob. Test statistic p-value
β1 −2.2428 −2.0743 1.000 −2.0722 1.000 −0.3573 0.7209
β2 0.0000 0.0452 0.267 0.0527 0.300 −0.3669 0.7137
β3 3.1668 3.0195 1.000 3.0167 1.000 0.5919 0.5539
β4 0.0000 −0.0402 0.200 −0.0265 0.133 −0.7003 0.4837
β5 −1.8701 −1.7313 1.000 −1.7316 1.000 0.1305 0.8962
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