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It's not exactly a sigmoid, although the |
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This is related to the [[probability mass function]] which is the equivalent for variables that assign positive probability to individual points. The probability mass function is therefore sometimes referred to as the ''discrete density function''.
In both cases, the cumulative distribution function is the integral (or, in the discrete case, the sum) for all values less than or equal to the current value of {{math|''x''}}, and so shows the accumulated probability so far. This is the sense in which it is ''cumulative''. Thus the probability density function of the [[normal distribution]] is a bell-curve, while the corresponding cumulative distribution function is a
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