annotations

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Adding Annotations to Objects

Annotations, that is, objects of class "annotation", are character vectors with all their elements named. Only one method is defined for this subclass of character vectors, a method for show, that shows the annotation in a nicely formatted way. Annotations of an object can be obtained via the function annotation(x) and can be set via annotation(x)<-value.

Elements of an annotation with names "description" and "wording" have a special meaning. The first kind can be obtained and set via description(x) and description(x)<-value, the second kind can be obtained via wording(x) and wording(x)<-value. "description" elements are used in way the "variable labels" are used in SPSS and Stata. "wording" elements of annotation objects are meant to contain the question wording of a questionnaire item represented by an "item" objects. These elements of annotations are treated in a special way in the output of the coodbook function.

Usage
annotation(x)
# S4 method for ANY
annotation(x)
# S4 method for item
annotation(x)
# S4 method for data.set
annotation(x)
annotation(x)<-value
# S4 method for ANY,character
annotation(x)<-value
# S4 method for ANY,annotation
annotation(x)<-value
# S4 method for item,annotation
annotation(x)<-value
# S4 method for vector,annotation
annotation(x)<-value

description(x) description(x)<-value

wording(x) wording(x)<-value

# S4 method for data.set description(x) # S4 method for importer description(x)

Arguments
x

an object

value

a character or annotation object

Value

annotation(x) returns an object of class "annotation", which is a named character. description(x) and wording(x) each usually return a character string. If description(x) is applied to a data.set or an importer object, however, a character vector is returned, which is named after the variables in the data set or the external file.

Aliases
  • annotation
  • annotation,ANY-method
  • annotation,item-method
  • annotation,data.set-method
  • annotation<-
  • annotation<-,ANY,NULL-method
  • annotation<-,ANY,character-method
  • annotation<-,ANY,annotation-method
  • annotation<-,item,annotation-method
  • annotation<-,vector,annotation-method
  • description
  • description,data.set-method
  • description,importer-method
  • description<-
  • wording
  • wording<-
  • annotation-class
  • show,annotation-method
Examples
# NOT RUN {
vote <- sample(c(1,2,3,8,9,97,99),size=30,replace=TRUE)
labels(vote) <- c(Conservatives         =  1,
                    Labour                =  2,
                    "Liberal Democrats"   =  3,
                    "Don't know"          =  8,
                    "Answer refused"      =  9,
                    "Not applicable"      = 97,
                    "Not asked in survey" = 99
                    )
missing.values(vote) <- c(97,99)
description(vote) <- "Vote intention"
wording(vote) <- "If a general election would take place next tuesday,
                    the candidate of which party would you vote for?"
annotation(vote)
annotation(vote)["Remark"] <- "This is not a real questionnaire item, of course ..."
codebook(vote)
# }
Documentation reproduced from package memisc, version 0.99.27.3, License: GPL-2

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