s="block">Returns the <a href="http://www.xycoon.com/standerrorb(1).htm">standard
 error of the slope estimate</a>,
 usually denoted s(b1).
 <p>
 If there are fewer that <strong>three</strong> data pairs in the model,
 or if there is no variation in x, this returns <code>Double.NaN</code>.
 </p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>standard error associated with slope estimate</dd></dl>
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