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I know the relation between central chi square and gamma random variables.But i am not able to get relation between gamma and non central chi-square distribution.

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  • $\begingroup$ Exactly what kind of "relation" are you seeking? Non-central chi-squares are not gammas, but there are various ways they could be expressed as mixtures of gammas and possibly there are good approximations using small finite mixtures of gammas. $\endgroup$ – whuber Jul 29 '17 at 13:52
  • $\begingroup$ Yes , I am seeking a easy and simple approximation of non central chi square to gamma distribution. $\endgroup$ – Akhil Singh Jul 30 '17 at 9:56

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