Normal distribution with alternative parameters | Vose Software

Normal distribution with alternative parameters

Format: NormalAlt(Value1, Prob1, Value2, Prob2)

NormalAlt equations


This alternative parameterization of the Normal distribution is useful for modeling expert estimates of some continuous quantity with equal tails, like time or cost to complete a task.

The NormalAlt distribution appears in the standard Select Distribution palette. It also appears in the Expert selector window when one selects two percentiles {(P1, X1), (P2, X2)}.


ModelRisk functions added to Microsoft Excel for the Alternative-Parameter Normal distribution

VoseNormalAlt generates random values from this distribution for Monte Carlo simulation, or calculates a percentile if used with a U parameter.

VoseNormalAltObject constructs a distribution object for this distribution.

VoseNormalAltProb returns the probability density or cumulative distribution function for this distribution.

VoseNormalAltProb10 returns the log10 of the probability density or cumulative distribution function.


Alternative-Parameter Normal distribution equations




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