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<p>generic particle filter estimates the posterior distribution of the hidden states using the observation measurement process. With respect to a state-space such as the one below:</p>

<p>
: the filtering problem is to estimate <b>sequentially</b> the values of the hidden states , given the values of the observation process  at any time step k.</p>

<p>All Bayesian estimates of  follow from the <a href="page.php?w=Posterior_probability">posterior density</a> . The particle filter methodology provides an approximation of these conditional probabilities</p><p>
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