.105 0.099 0.122 0.125
</pre><p>First clear some variables from possible previous runs.</p><pre class="codeinput">clear <span class="string">data</span> <span class="string">model</span> <span class="string">options</span>
</pre><p>Next, create a data structure for the observations and control variables. Typically one could make a structure <tt>data</tt> that contains fields <tt>xdata</tt> and <tt>ydata</tt>.</p><pre class="codeinput">data.xdata = [28    55    83    110   138   225   375]';   <span class="c