es the <span class="pkg">doParallel</span> package if <code>n_cores &gt; 1</code>. In that case it also uses the <span class="pkg">doRNG</span> package to make the results replicable. See <code><a href="https://rdrr.io/pkg/doRNG/man/infoDoRNG.html" class="external-link">?doRNG</a></code> and <code>?doParallel</code> for more details. Using multiple cores will speed up the calculation considerably in most cases.</p></dd>
<dt>na.action</dt>
<dd><p>How missing values should be handled. Can be one of: na.fail, 