求助rms包的安装
本人初学R语言，需要安装使用rms程序包，为何提示错误
install.packages("rms")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
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本人初学R语言，需要安装使用rms程序包，为何提示错误
install.packages("rms")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
