span> <span class="va">Time</span> <span class="op">*</span> <span class="va">X1</span>, </span></span>
<span class="r-in"><span>mixture <span class="op">=</span><span class="op">~</span> <span class="va">Time</span>, random <span class="op">=</span><span class="op">~</span> <span class="va">Time</span>, classmb <span class="op">=</span><span class="op">~</span> <span class="va">X2</span> <span class="op">+</span> <span class="va">X3</span>, subject <span class="op">=</span> <span class="st">'ID'</span>, ng