distributed random
          variables with means &#956;<sub>i</sub> &#160; and variances &#963;<sub>i</sub><sup>2</sup>, then the random variable:
        </p>
<p>
          <span class="inlinemediaobject"><img src="../../../../equations/chi_squ_ref1.svg"></span>
        </p>
<p>
          is distributed according to the Chi-Squared distribution.
        </p>
<p>
          The Chi-Squared distribution is a special case of the gamma distribution
          and has a single parameter &#957; &#160; that specif