2.6 Chapter summary

R is a statistical programming language and associated contributed packages. It is free to download and use. You code in R by writing scripts. Lines of R typically apply functions to objects. The objects belong to various different classes. Variables are objects in R, and a complete data set is an object of the class data.frame. Functions include familiar statistical computations such as the mean and standard deviation, as well as many others. You can read data into R in multiple formats including .csv and Rdata. We investigated how to load in the data from a study, and obtain descriptive statistics and some quick plots.