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== probability density function ==
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<div class="definition"><div class="short_definition">(''Or'' density function; <br/>''also called'' frequency function.) The [[statistical]]  function that shows how the density of possible observations in a [[population]] is distributed.</div><br/> <div class="paragraph">It is the derivative ''f''(''x'') of the [[distribution function]] ''F''(''x'') of a [[random variable]], if ''F''(''x'') is  differentiable. Geometrically, ''f''(''x'') is the [[ordinate]] of a curve such that ''f''(''x'')''dx'' yields the [[probability]]  that the random variable will assume some value within the [[range]] ''dx'' of ''x''. The density function  is nonnegative, and its total integral is unity. Sometimes the probability density function is called  the distribution function, but this practice causes confusion and is not recommended.</div><br/> </div>
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