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<p>to be imperfect measurements of underlying variables  and  with independent errors, then  estimates the true correlation between  and .</p>

<p><big>Noise level estimation</big></p>
<p>The estimation of noise variance  from measurements  (and analogously for ) is called noise-level estimation. A variety of estimators can be used for this purpose. Equivalently, one may estimate the reliability or the signal-to-noise ratio.</p>

<p><big>Applicability</big></p>
<p>A correction for regression dilution is necessary in <a href="page.php?w=statistical_inference">statistical inference</a></p><p>
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