t'>"2020-03-13"</span><span class='op'>)</span><span class='op'>)</span> <span class='op'>%&gt;%</span>
    <span class='fu'>sign_test</span><span class='op'>(</span>event_start <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/pkg/zoo/man/yearmon.html'>as.Date</a></span><span class='op'>(</span><span class='st'>"2020-03-16"</span><span class='op'>)</span>,
              event_end <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/pkg/zoo/man/yearmon.html'>as.Date</a></spa