n><span class="identifier">X</span><span class="special">/</span><span class="identifier">v1</span><span class="special">)</span> <span class="special">/</span> <span class="special">(</span><span class="identifier">Y</span><span class="special">/</span><span class="identifier">v2</span><span class="special">)</span>
</pre>
<p>
            where X is a noncentral &#967;<sup>2</sup>
random variable with <span class="emphasis"><em>v1</em></span>
            degrees of freedom and non-centrality parameter &#95