pan class="op">=</span><span class="st">"time"</span>,</span>
<span class="r-in">                    event<span class="op">=</span><span class="st">"event"</span>,</span>
<span class="r-in">                    method<span class="op">=</span><span class="st">"iptw_km"</span>,</span>
<span class="r-in">                    treatment_model<span class="op">=</span><span class="va">group</span> <span class="op">~</span> <span class="va">x1</span> <span class="op">+</span> <span class="va">x2</span> <span class="o