Dear class,

Some of you are still having trouble manipulating your data.  Here are a couple of links that might help.

First, Quick-R is a set of web help pages that are fairly well written and have decent examples for most of the topics they cover.  There are a series of links on the left menu that let you get to the general topic you are interested in.  One of them is called “Data Management” and that page has stuff on sorting, merging, aggregating and subsetting data among other things.

Second, you can go to the UMass library site and link to the Books 24×7 database.  (The direct link may not work if you are off-campus, but it seems to work on-campus.  Going through the library always works!)   If you then search for R statistics, you get a list of online books that you can look through (or download if you prefer).  R for Dummies has a lot of preactical advice for massaging your data.  Michael Crawley’s “The R Book” has a little bit about a lot of different statistics in R.  The Art of R Programming is also available, as well as a lot of stuff that has nothing to do with R.

Have fun.

Jack