gps</span> <span class="op">&lt;-</span> <span class="fu"><a href="estimate_gps.html">estimate_gps</a></span><span class="op">(</span>.data <span class="op">=</span> <span class="va">mydata</span>,</span></span>
<span class="r-in"><span>                              .formula <span class="op">=</span> <span class="va">w</span> <span class="op">~</span> <span class="va">cf1</span> <span class="op">+</span> <span class="va">cf2</span> <span class="op">+</span> <span class="va">cf3</span> <span class="op">+</sp