a parametric model over our finite sample, we need strategies that avoid parametric modelling. One such strategy exploits the exchangeability of finite samples drawn from a population.</p>
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<h2 id="exchangeability">Exchangeability<a class="anchor" aria-label="anchor" href="#exchangeability"></a>
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<p>A finite sequence <span class="math inline">\((\mathbf{x}_1,\ldots,\mathbf{x}_N)\)</span> of random variables is called exchangeable if <span class="math display">\