IRM</span><span class='op'>(</span>nitem <span class='op'>=</span> <span class='fl'>15</span>, nperson <span class='op'>=</span> <span class='fl'>1000</span>, group.size <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='fl'>700</span>, <span class='fl'>300</span><span class='op'>)</span>,
dif <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='fu