Download A Tiny Handbook of R by Mike Allerhand (auth.) PDF

By Mike Allerhand (auth.)

This short offers a roadmap for the R language and programming setting with signposts to additional assets and documentation.

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Addmargins calculates marginal sums by default. For alternative summaries pass a function, for example mean, to the FUN argument. 9 For example a table with multiple statistics of multiple variables split on a grouping factor. [ libraryðpsychÞ # For'describe:by' [ libraryðabindÞ # For'abind' [ a¼describe:byðiris½1:4Š; iris$SpeciesÞ [ a¼abindða; along¼0Þ [ ftableða; col:vars¼3Þ Tables may be converted to data frames and combined using rbind and cbind. This would be necessary if the tables are to contain both numeric and character data, some columns of numbers and some columns of names.

The index is then applied element-wise and addresses cells corresponding to cells of the logical vector that are TRUE. 6 Sorting There is a function rev that reverses a vector’s order, and a function sort sorts a vector numerically or alphabetically into ascending or descending order. A more flexible approach is to sort by deriving and applying an appropriate index vector. 4 Indexing 33 The benefit of this two-step approach is that it enables you sort one vector by another or, for example, to sort the rows of a data frame by one or more of the columns.

In the formula the frequency variable is specified on the left side of the tilde, and the grouping factors separated by + signs are specified on the right. Alternatively a . on the right side can be used to specify all the variables in the data frame except the frequency variable denoted on the left side. The left side of the formula can be empty, in which case the frequency of each cell is assumed to be 1. 6 The main purpose of having a separate class "table" is to enable the generic summary function to select a method to carry out a chi-squared test for independence of factors, given a table object.

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