"https://dplyr.tidyverse.org/reference/mutate.html" class="external-link">mutate</a></span><span class="op">(</span>change<span class="op">=</span><span class="va">population_2010</span><span class="op">/</span><span class="va">households_2010</span><span class="op">-</span><span class="va">population_2000</span><span class="op">/</span><span class="va">households_2000</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="op">}</span></sp