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Table 2 Results of log-likelihood ratio tests that compare different site models

From: Evolutionary analysis of mitochondrially encoded proteins of toad-headed lizards, Phrynocephalus, along an altitudinal gradient

Test for Null Model Experimental Model df P-value
Difference in ω among sites Model 0 (one ratio) Model 1A (nearly neutral) 2 < 0.0001
Positive selection Model 1A (nearly neutral) Model 2A (positive selection) 2 > 0.9996
Difference in ω among sites Model 0 (one ratio) Model 3 (discrete) 2 < 0.0001
Positive selection Model 7 (beta) Model 8 (beta & ω) 2 < 0.0001