inverse Gaussian (Wald) distribution - Maple Help

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Statistics[Distributions][InverseGaussian] - inverse Gaussian (Wald) distribution

Calling Sequence

InverseGaussian(mu, lambda)

InverseGaussianDistribution(mu, lambda)

Parameters

mu

-

distribution mean

lambda

-

scale parameter

Description

• 

The inverse Gaussian distribution is a continuous probability distribution with probability density function given by:

ft=0t<02λπt3&ExponentialE;λtμ22μ2t2otherwise

  

subject to the following conditions:

0<μ,0<λ

• 

Note that the InverseGaussian command is inert and should be used in combination with the RandomVariable command.

Examples

withStatistics&colon;

X:=RandomVariableInverseGaussian&mu;&comma;&lambda;&colon;

PDFX&comma;u

&lcub;0u<0122&lambda;&pi;u3&ExponentialE;12&lambda;u&mu;2&mu;2uotherwise

(1)

PDFX&comma;0.5

1.128379166&lambda;&ExponentialE;1.000000000&lambda;0.51.&mu;2&mu;2

(2)

MeanX

&mu;

(3)

VarianceX

&mu;3&lambda;

(4)

See Also

Statistics, Statistics[Distributions], Statistics[RandomVariable]

References

  

Evans, Merran; Hastings, Nicholas; and Peacock, Brian. Statistical Distributions. 3rd ed. Hoboken: Wiley, 2000.

  

Johnson, Norman L.; Kotz, Samuel; and Balakrishnan, N. Continuous Univariate Distributions. 2nd ed. 2 vols. Hoboken: Wiley, 1995.

  

Stuart, Alan, and Ord, Keith. Kendall's Advanced Theory of Statistics. 6th ed. London: Edward Arnold, 1998. Vol. 1: Distribution Theory.


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