TABLE 2

Models of variable ζ among sites

ModelPaEstimable parametersConstraints
Neutral2ζ0, p0 ζ0 < 1, ζ1 = 1, p1 = 1 − p0
Two-category3ζ0, ζ1, p0ζ0 < 1, ζ1 ≥ 1, p1 = 1 − p0
Three-category4ζ0, ζ2, p0, p1ζ0 < 1, ζ1 = 1, ζ2 > 1, p2 = 1 − p0p1
  • a P, number of estimable parameters in the ζ distribution.