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Table 3 LRT statistics 2Δℓ = 2(ℓ1 – ℓ0) for model comparisons.

From: Evolution of the class C GPCR Venus flytrap modules involved positive selected functional divergence

Alternative model vs. Null model 2Δℓ df χ21% p
M2 (positive selection) vs. M0 (one-ratio) 20.551 3 11.345 < 0.01
M2 (positive selection) vs. M1 (nearly neutral) 15.834 2 9.210 < 0.01
  1. χ21% values are the critical value of χ2 distribution at 1% level with appropriate degree of freedom.