 effective sample size.</p>
<p>Because of the noise in the correlation estimates <span class="math inline">\(\hat{\rho}_t\)</span> as <span class="math inline">\(t\)</span> increases, a typical truncated sum of <span class="math inline">\(\hat{\rho}_t\)</span> is used. Negative autocorrelations may occur only on odd lags and by summing over pairs starting from lag 0, the paired autocorrelation is guaranteed to be positive, monotone and convex modulo estimator noise <span class="citation">Geyer (<a href="#re