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Table 1 Mixture models of ω and λ

From: Identification of physicochemical selective pressure on protein encoding nucleotide sequences

Model Site classes* parameters constraints P**
A1 (i), (ii), (iii), (iv) ω0, ω1, γ0, γ1, p0 p1, p2 ω0≤1, ω1>1, γ0≤1, γ1>1, p3 = 1-p0-p1-p2 7
A2 (i), (iii) ω0, ω1, γ, p0 ω0≤1, ω1>1, γ≤1 4
  1. * With regard to the site classes listed in Equation (2)
  2. ** P = number of parameters in the ω and γ distributions