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Computer generation of gamma random variables—II

Published: 01 November 1978 Publication History

Abstract

A rejection method is proposed for generating gamma variates with nonintegral shape parameter α, α > 1. This method is similar to other methods given by Fishman, Wallace, and Tadikamalla and is faster than these methods for α > 2. The core storage requirements and the programming effort for the proposed method are similar to those of Wallace's or Tadikamalla's methods. The computational times for the proposed method remain fairly constant for medium and large values of α and are superior to times obtained by Arhens and Dieter's method for all values of α. The proposed method is simpler than Ahrens and Dieter's method.

References

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Ahrens, J.H., and Dieter, U. Computer methods for sampling from gamma, beta, Poisson and binomial distributions. Computing 12 (1974), 223-246.
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Dudewicz, E.J. Speed and quality of random numbers. Annual Tech. Conf. Trans. ASQC, Vol. 29, 1975, pp. 170-180.
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Fishman, G.S. Sampling from the gamma distribution on a computer. Comm. ACM. 19, 7 (July 1976), 407-409.
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Greenwood, A.J. A fast generator for gamma distributed random variables. In CompStat, G. Bruckman et al., Eds., Physica Verlag, Vienna, 1974, pp. 19-27.
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Tadikamalla, P.R. Computer generation of gamma random variables. Comm. ACM 21, 5 (May 1978), 419-422.
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Tadikamalla, P.R. FORTRAN programs for computer generation of gamma random variables. Tech. Rep., Dept. Business Admin., Eastern Kentucky U., Richmond, Ky., 1977.
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Tadikamalla, P.R., and Johnson, M.E. Some simple rejection methods for sampling from the normal distribution. Proc. First Int. Conf. Math. Modeling, St. Louis, Mo., 1977, 573-578.
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Association for Computing Machinery

New York, NY, United States

Publication History

Published: 01 November 1978
Published in CACM Volume 21, Issue 11

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  1. computer methods
  2. gamma variables
  3. rejection method

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