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See the package notes for further information.
A Gentle Introduction
A gentle introduction to time series analysis is available for free.
Usually updated in mid-August; check version on title page.
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download R from CRAN
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.