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Site-specific models Allow ω vary among sites.<br />

H 0: uniform selective pressure among sites (M0)<br />

H 1: variable selective pressure among sites (M3)<br />

p p<br />

ω ω<br />

Likelihood ratio test (LRT)<br />

2Δl = 2 (l 1-l 0) χ 2 distribution<br />

SERVE PER VERIFICARE<br />

SE ω VARIA FRA I SITI.<br />

NON E’ CONSIDERATO UN<br />

TEST PER VERIFICARE LA<br />

PRESENZA/ASSENZA DI<br />

SELEZIONE

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