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  as the sum of a central chisquare with df degrees of freedom plus a
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  as the sum of a central chisquare with df degrees of freedom plus a
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  noncentral chisquare with zero degrees of freedom (which is a Poisson
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  noncentral chisquare with zero degrees of freedom (which is a Poisson
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  mixture of central chisquares with integer degrees of freedom),
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  mixture of central chisquares with integer degrees of freedom),
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  see Formula (29.5b-c) in Johnson, Kotz, Balakrishnan (1995).
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  see Formula (29.5b-c) in Johnson, Kotz, Balakrishnan (1995).
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  The noncentral chisquare with arbitary degrees of freedom is of interest
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  The noncentral chisquare with arbitrary degrees of freedom is of interest
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  for simulating the Cox-Ingersoll-Ross model for interest rates in
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  for simulating the Cox-Ingersoll-Ross model for interest rates in
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  finance.
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  finance.
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  R code that works is
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  R code that works is
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