UCLA Statistics has a pretty extensive list of resources on how to use R and GRASS. For those unfamiliar, R is a programming language and environment for statistical computing and graphics. GRASS is an open source geographic information system (GIS). And of course, both are completely free and completely useful.
Useful Stat Resources for R and GRASS
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Chances it’s a Friend’s Birthday Every Single Day of the Year
If it seems like every day you log in to Facebook, it’s someone’s birthday, you’re probably not that far off.