The R Book

Index

Entries in bold are R functions

-1remove the intercept from a model, 333

remove the intercept in model.matrix, 193

- deletion of an explanatory variable, 331

* inclusion of main effects plus interactions between explanatory variables, 331

/ nesting of an explanatory variable, 331

: inclusion of interactions between explanatory variables, 331

\\ double backslash in file path definitions, 98

| given nested explanatory variables, 331

+ inclusion of an explanatory variable, 331

= = double equals for logical equals, 27

= = testing for equality of real numbers, 77

3:1 Mendel's peas, 552

I(upper case i) include "as is" in the model formula, 332

! factorial definition, 242

! factorial, 11

!(not) drop rows from a dataframe, 118

not operator, 15

! factorial introduction, 206

! the not operator, testing types, 88

!= logical not equals function, 27

!duplicatedsame as unique, 125

!is.na not missing values, 84

!is.numeric testing, 88

#RRGGBB string specification of colour (red,green,blue), 855

$, 16

component selection, 341

dataframe name and variable name, 100, 166

extracting information from model objects, 359

last character searching, 80

$ element name operator for indexing lists, 15

trailing blanks, 86

%% in calculating medians, 48

%*% matrix multiplication, 260

%a abbreviated weekday name, 92

%A full weekday name, 92

%b abbreviated month name, 92

%B full month name, 92

%c date and time, locale-specific, 92

%d day of the month as decimal number (01-31), 92

%H hours as decimal number ...