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Les modèles non linéaires à effets mixtes - Isped

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Estimation of the likelihood<br />

Importance sampling:<br />

g(y) =<br />

=<br />

=<br />

∫<br />

f(y, φ)dφ<br />

∫<br />

h(y|φ)π(φ)dφ<br />

∫ (<br />

h(y|φ) π(φ) )<br />

˜π(φ)<br />

˜π(φ)dφ<br />

1) Draw φ (1) , φ (2) , . . . , φ (N) with the distribution ˜π,<br />

2) Let<br />

ĝ N (y) = 1 N∑<br />

h(y|φ (j) ) π(φ(j) )<br />

N<br />

˜π(φ (j) )<br />

j=1<br />

Sminaire ”Statistique et Sant Publique”, Bordeaux - 8 novembre 2005, p.34

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