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Cumulative distribution function (cdf)


The cdf of a random variable X at point x is the probability that X takes values at or below this point. Hence, F{x) = P[X  x]. The following properties must hold for any cdf: it is a non-decreasing right-continuous function; it tends to 0 at minus infinity and tends to 1 at plus infinity.


Reference: Oxford Press Dictonary of Economics, 5th edt.