# How to Install an R Package?

### Longhai Li, Department of Mathematics and Statistics, University of Saskatchewan

I occacionally publish R add-on packages for others to implement and test the statistical methodoglogies I discuss in my papers. R is a free software environment for statistical computing and graphics, available from http://www.r-project.org. The following is a brief instruction of installing R packages. More details can be found by typing **?INSTALL** in R console.
## Install a new package to your computer

### Method 1: Install from source

Download the add-on R package, say **mypkg**, and type the following command in Unix console to install it to **/my/own/R-packages/**:

**$ R CMD INSTALL mypkg -l /my/own/R-packages/**

### Method 2: Install from CRAN directly

Type the following command in R console to install it to **/my/own/R-packages/** directly from CRAN:

**> install.packages("mypkg", lib="/my/own/R-packages/")**

## Load the library

Type the following command in R console to load the package

**> library("mypkg", lib.loc="/my/own/R-packages/")**

## Instructions of using R

If you are new to R, you can learn very quickly how to use R, following for example these introductions:

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