m.</p>
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    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>The function returns a matrix of results.</p>
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    <div class="section level2">
    <h2 id="references">References<a class="anchor" aria-label="anchor" href="#references"></a></h2>
    <p>Wetherill, G.B. and Brown, D.W. (1991) <em>Statistical Process Control</em>, New York, Chapman and Hall, pp. 216–218</p>
    </div>
    <div class="section level2">
   