By selecting Akaike weights and Bayes factors (max = 1) on the Current results tab of the Options dialog box, one obtains the rescaling
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The best model according to, say, AIC has AICL = 1 while inferior models have AICL between 0 and 1. See Burnham and Anderson (2002) for further discussion of AICL, and Raftery (1993, 1995) and Madigan and Raftery (1994) for further discussion of BICL.