(\hat{P}_{t&#39;}=\hat{\rho}_{2t&#39;}+\hat{\rho}_{2t&#39;+1}\)</span>. Initial positive sequence estimators is obtained by choosing the largest <span class="math inline">\(m\)</span> such that <span class="math inline">\(\hat{P}_{t&#39;}&gt;0, \quad t&#39; = 1,\ldots,m\)</span>. The initial monotone sequence is obtained by further reducing <span class="math inline">\(\hat{P}_{t&#39;}\)</span> to the minimum of the preceding ones so that the estimated sequence is monotone.</p>
</div>
<div id="estimation-of-