># formula notation</span></span>
<span class='r-in'><span class='fu'>betta</span><span class='op'>(</span>formula <span class='op'>=</span> <span class='va'>chats</span> <span class='op'>~</span> <span class='va'>Cont_var</span>, ses <span class='op'>=</span> <span class='va'>ses</span>, data <span class='op'>=</span> <span class='va'>df</span><span class='op'>)</span></span>
<span class='r-out co'><span class='r-pr'>#&gt;</span> $table</span>
<span class='r-out co'><span class='r-pr'>#&gt;</span>         