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<h3>Method Detail</h3>
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<h4>addData</h4>
<pre>public&nbsp;void&nbsp;addData(double&nbsp;x,
           double&nbsp;y)</pre>
<div class="block">Adds the observation (x,y) to the regression data set.
 <p>
 Uses updating formulas for means and sums of squares defined in
 "Algorithms for Computing the Sample Variance: Analysis and
 Recommendations", Chan, T.F., Golub, G.H., and LeVeque, R.J.
 1983, American Stat