This is the R package for the text and it can be obtained in various ways. See the package notes for further information.

A gentle introduction to time series analysis is available for free. Usually updated in mid-August; check version on title page.

If you're at a University that subscribes to the Springer library, you can download it for free from the Springer Link. Instructors interested in adopting the text can find more information by following the About this Book link.

R can be downloaded from CRAN (Comprehensive R Archive Network). RStudio can make using R much easier, especially for the novice. Serious users should use Microsoft R Open (free) -- it runs on many different platforms.