RANDLEVY returns a Levy-distributed random number. If beta is omitted, it is assumed to be 0.
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For alpha = 1, beta=0, we get the Lorentz distribution.
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For alpha = 2, beta=0, we get the normal distribution.
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If alpha <= 0 or alpha > 2, RANDLEVY returns #NUM! error.
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If beta < -1 or beta > 1, RANDLEVY returns #NUM! error.