s="op">=</span> <span class="va">nested_serie</span> <span class="op">%&gt;%</span> <span class="fu"><a href="https://rdrr.io/r/utils/head.html">head</a></span><span class="op">(</span><span class="fl">3</span><span class="op">)</span>,
                                       .prop <span class="op">=</span> <span class="fl">0.8</span>,
                                       <span class="va">m_auto_arima</span>,
                                       <span class="va">m_stlm_arima</span>,
                     