phfit.3mom | R Documentation |
Estimates PH parameters from three moments.
phfit.3mom( m1, m2, m3, method = c("Osogami06", "Bobbio05"), max.phase = 50, epsilon = sqrt(.Machine$double.eps) )
m1 |
A value of the first moment. |
m2 |
A value of the second moment. |
m3 |
A value of the third moment. |
method |
The name of moment matching method. |
max.phase |
An integer for the maximum number of phases in the method "Osogami06". |
epsilon |
A value of precision in the method "Osogami06". |
An object of GPH.
The method "Osogami06" checks the first three moments on whether there exists a PH whose three moments match to them. In such case, the method "Bobbio05" often returns an error.
Osogami, T. and Harchol-Balter, M. (2006) Closed Form Solutions for Mapping General Distributions to Minimal PH Distributions. Performance Evaluation, 63(6), 524–552.
Bobbio, A., Horvath, A. and Telek, M. (2005) Matching Three Moments with Minimal Acyclic Phase Type Distributions. Stochastic Models, 21(2-3), 303–326.
## Three moment matching ## Moments of Weibull(shape=2, scale=1); (0.886227, 1.0, 1.32934) (result1 <- phfit.3mom(0.886227, 1.0, 1.32934)) ## Three moment matching ## Moments of Weibull(shape=2, scale=1); (0.886227, 1.0, 1.32934) (result2 <- phfit.3mom(0.886227, 1.0, 1.32934, method="Bobbio05")) ## mean ph.mean(result1) ph.mean(result2) ## variance ph.var(result1) ph.var(result2) ## up to 5 moments ph.moment(5, result1) ph.moment(5, result2)
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