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 surroundings with signposts to extra assets and documentation.

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Parðmfrow¼cð2; 2ÞÞ # 2 x 2layout [ sapplyðiris½1:4Š; histÞ # Plot four histograms ðiris dataÞ [ layoutðmatrixð1:4; nrow¼2; byrow¼TÞÞ # . . same thing using layout [ sapplyðiris½1:4Š; histÞ [ layoutðmatrixðcð1; 1; 2; 3Þ; nrow¼2; byrow¼TÞÞ # Merging panels [ sapplyðiris½1:3Š; histÞ # . . screen function enables panels within a single device to be treated as separate devices, (called ‘‘screens’’). Subsequent plots can be addressed to any screen, and high-level plots can be superposed on the same screen.

7 table omits NA by default. Set argument useNA="ifany" to include a count of NA. table. 8 The table data can be rounded to a given number of decimal places using function round. [ tab¼tableðx$Hair; x$EyeÞ [ prop:tableðtab; margin¼1Þ # 2ÀD table # Proportions of each row sum [ roundðprop:tableðtab; margin¼1ÞÃ100; 2Þ # . . 2 Tables of Cell Means and Other Summaries The tapply function maps a given function to groups of a vector split on one or more factors. If the vector is split on more than one factor, the factors must be passed as a single list argument.

Table uses a margin argument to specify which margin (which dimension of the table) to calculate along. For example in a 2-D table margin=1 specifies calculations along each row, and margin=2 specifies calculations down each column. The addmargins function uses the margin argument to specify which margin to add to the table. In a 2-D table margin=1 adds a row margin, (at the foot of the table), margin=2 adds a column margin (on the right of the table). addmargins calculates marginal sums by default.

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