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Table 4 Parameter estimates and likelihood ratio tests for the site models

From: Genome-wide analysis of the Solanum tuberosum (potato) trehalose-6-phosphate synthase (TPS) gene family: evolution and differential expression during development and stress

Model p a LnLb Estimates of Parameters 2lc df p Positively selected sites
M0 (one ratio model) 1 -47935.395 ω=0.143 - - - None
Site-specific models
 M1: Neutral (k=2) 1 -47271.650 p 0 =0.774, (p 1 =0.226) - - - Not allowed
 M2 : Selction (k=3) 3 -47271.650 p 0 =0.774, p 1 =0.048, (p 2=0.178), ω2=1.000 M2 vs M1: 0.000 1 1.000 None
 M3: discrete (K=5) 5 -46728.169 p 0 =0.244, p 1 =0.389, p 2 =0.263, p 3 =0.094, p 4 =0.011, ω0=0.010, ω1=0.085, ω2=0.317, ω3=0.799, ω4=6.007 M3 vs M0: 2414.452 4 0.000 1 (p>0.95)
 M7: beta 2 -46761.572 p=0.513, q=1.910 - - - Not allowed
 M8: beta & w>1 4 -46732.126 p 0 =0.947, p=0.589, q=2.892, (p 1 =0.053) ω=1.293 M8 vs M7: 58.891 2 0.000 6 (p>0.95), 3 (p>0.95)
  1. aThe number of free parameters for the ω ratios
  2. bLikelihood of the model
  3. c2(l1-l0)