decision tree - Unable to install C50 package in r language -

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i installing c5.0 package "c50" in r-language , following error:

installing package(s) ‘c:\users\rxn\documents/r/win-library/2.12’ (as ‘lib’ unspecified) --- please select cran mirror use in session --- warning message: in getdependencies(pkgs, dependencies, available, lib) :   package ‘c50’ not available

i have tried on multiple machines , on both xp , windows 7.


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