data frames

Selection in R

June 1, 2012 | John Mount

The design of the statistical programming language R sits in a slightly uncomfortable place between the functional programming and object oriented paradigms. The upside is you get a lot of the expressive power of both programming paradigms. A downside of this is: the not always useful variability of the language’... [Read more...]

data.frame objects in R (via “R in Action”)

December 18, 2011 | Tal Galili

The followings introductory post is intended for new users of R. It deals with R data frames: what they are, and how to create, view, and update them. This is a guest article by Dr. Robert I. Kabacoff, the founder of (one of) the first online R tutorials websites: Quick-R. ... [Read more...]

Example 8.20: Referencing lists of variables, part 2

January 10, 2011 | Ken Kleinman

In Example 8.19, we discussed how to refer to a group of variables with sequential names, such as varname1, varname2, varname3. This is trivial in SAS and can be done in R as we showed.It's also sometimes useful to refer to all variables which begin w...

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Example 8.19: Referencing lists of variables

January 3, 2011 | Nick Horton

In section 1.11.4 (p. 50), we discuss referring to lists of variables in a data set. In SAS, this can be done for variable stored in adjacent columns with the "var_x -- var_y" syntax and for variables with sequentially enumerated suffixes with the "va...

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data frames

Selection in R

data.frame objects in R (via “R in Action”)

Example 8.20: Referencing lists of variables, part 2

Example 8.19: Referencing lists of variables

data frames

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