12.11.2014 Views

Les modèles non linéaires à effets mixtes - Isped

Les modèles non linéaires à effets mixtes - Isped

Les modèles non linéaires à effets mixtes - Isped

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

The EM algorithm (Expectation-Maximization)<br />

(Dempster, Laird et Rubin, 1977)<br />

Complete-data model: (y, φ) ∼ f(·, · ; θ) ; only y is observed.<br />

Iteration k of the algorithm:<br />

step E : evaluate the quantity<br />

Q k (θ) = E[log f(y, φ; θ)|y; θ k−1 ]<br />

step M : update the estimation of θ:<br />

θ k = Argmax Q k (θ)<br />

Sminaire ”Statistique et Sant Publique”, Bordeaux - 8 novembre 2005, p.23

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!