r/datasets/mtcars.html">mtcars</a></span>,
  y <span class="op">=</span> <span class="va">am</span>,
  x <span class="op">=</span> <span class="va">cyl</span>,
  bf.details <span class="op">=</span> <span class="cn">TRUE</span>,
  xlab <span class="op">=</span> <span class="st">"Number of cylinders"</span>,
  ylab <span class="op">=</span> <span class="cn">NULL</span>,
  data.label <span class="op">=</span> <span class="st">"both"</span>,
  label.fill.alpha <span class="op">=</span> <span class="fl">.3</spa