Читать книгу Probability with R - Jane M. Horgan - Страница 24

When the data set is large, it is better to set up a text file to store the data than to enter them directly from the screen.

A large data set is usually stored as a matrix, which consists of columns and rows. The columns denote the variables, while the rows are the observations on the variables. In R, this type of data set is stored in what is referred to as a data frame.