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<p>must also be specified when running a non-parametric estimation.</p>

<p><big>Definition</big></p>
<p>A kernel is a <a href="page.php?w=non-negative">non-negative</a> <a href="page.php?w=real-valued_function">real-valued</a> <a href="page.php?w=integrable">integrable</a> function K. For most applications, it is desirable to define the function to satisfy two additional requirements:</p>

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*<a href="page.php?w=Normalizing_constant">Normalization</a>:<br/>
:</p>

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*<a href="page.php?w=Even_and_odd_functions">Even-function</a> Symmetry:<br/>
:The first</p><p>
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