We will use the computer package R.
R is an extensive computer package that may perform a number of statistical and numerical computations. R can also be used to produce high quality graphics. Click here for information.
R is open source, and you may download it for free to your PC. A brief introduction to R will be given at the first lecture.
The book by Vittinghoff, Shiboski, Glidden og McCulloch gives examples of output from the statistical package Stata. Below are R commands that produce (almost) the same results as those shown in the book: