ss="r-in"><span></span></span>
<span class="r-in"><span><span class="co">#show local mean and inner 2-sd interval to help diagnose changing mean</span></span></span>
<span class="r-in"><span><span class="co">#or variance structure</span></span></span>
<span class="r-in"><span><span class="va">x</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">1000</span></span></span>
<span class="r-in"><span><span class="va">y</span> <span class="op">&lt;-</span> <span