coga

Evaluation for density and distribution function of convolution of gamma distributions in R. Two related exact methods and one approximate method are implemented with efficient algorithm and C++ code. A quick guide for choosing correct method and usage of this package is given in package vignette. For the detail of methods used in this package, we refer the user to Mathai(1982)[https://doi.org/10.1007/BF02481056], Moschopoulos(1984)[https://doi.org/10.1007/BF02481123], Barnabani(2017)[https://doi.org/10.1080/03610918.2014.963612], Hu et al.(2020)[https://doi.org/10.1007/s00180-019-00924-9].

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