R之package

包（package）是R函数、数据、预编译代码以一种定义完善的格式组合成的集合。
安装包可能遇到的问题：

Warning: 无法在貯藏處https://mirrors.tuna.tsinghua.edu.cn/CRAN/src/contrib中读写索引:无法打开URL’https://mirrors.tuna.tsinghua.edu.cn/CRAN/src/contrib/PACKAGES’

解决方法：chooseCRANmirror()​ 更换到 USA(CA 1)。

> install.packages("vcd")--- 在此連線階段时请选用CRAN的鏡子 ---还安装相依关系‘zoo’, ‘colorspace’, ‘lmtest’试开URL’https://cran.cnr.berkeley.edu/bin/windows/contrib/3.3/zoo_1.7-14.zip'Content type 'application/zip' length 904707 bytes (883 KB)downloaded 883 KB试开URL’https://cran.cnr.berkeley.edu/bin/windows/contrib/3.3/colorspace_1.3-2.zip'Content type 'application/zip' length 441419 bytes (431 KB)downloaded 431 KB试开URL’https://cran.cnr.berkeley.edu/bin/windows/contrib/3.3/lmtest_0.9-34.zip'Content type 'application/zip' length 283964 bytes (277 KB)downloaded 277 KB试开URL’https://cran.cnr.berkeley.edu/bin/windows/contrib/3.3/vcd_1.4-3.zip'Content type 'application/zip' length 1266709 bytes (1.2 MB)downloaded 1.2 MB程序包‘zoo’打开成功，MD5和检查也通过程序包‘colorspace’打开成功，MD5和检查也通过程序包‘lmtest’打开成功，MD5和检查也通过程序包‘vcd’打开成功，MD5和检查也通过下载的二进制程序包在        C:\Users\Administrator\AppData\Local\Temp\RtmpkFfQE4\downloaded_packages里> library(vcd)载入需要的程辑包：grid> example(Arthritis)Arthrt> data("Arthritis")Arthrt> art <- xtabs(~ Treatment + Improved, data = Arthritis, subset = Sex == "Female")Arthrt> art         ImprovedTreatment None Some Marked  Placebo   19    7      6  Treated    6    5     16Arthrt> mosaic(art, gp = shading_Friendly)等待页面改变的确认...Arthrt> mosaic(art, gp = shading_max)等待页面改变的确认...>