p'>&lt;-</span> <span class='fu'>networktree</span><span class='op'>(</span>nodevars<span class='op'>=</span><span class='va'>d</span><span class='op'>[</span>,<span class='fl'>3</span><span class='op'>:</span><span class='fl'>5</span><span class='op'>]</span>, splitvars<span class='op'>=</span><span class='va'>d</span><span class='op'>[</span>,<span class='fl'>1</span><span class='op'>:</span><span class='fl'>2</span><span class='op'>]</span>,
                     alpha<span class='op'>=</span><span class=