anchors (version 3.0-7)

replace.value: Replaces occurences of a value with another value in set of columns

Description

Replaces a single value in a set of columns with another given value. This makes it easy to change the default missing value indicator, for example.

Usage

replace.value( data, names, from=NA, to=as.integer(0), verbose = FALSE)

Arguments

data

data frame

names

a vector of character strings identifying columns to be updated

from

value to find and replace, can specify vectors

to

replacement value, must be a scalar

verbose

prints warnings if typeof(from) != typeof(to)

Value

• A data frame, with the same number of observations as the input data, but with replaced values as specified.

Details

Will replace storage mode of 'to' with mode of 'from' in dataset.

References

Wand, Jonathan; Gary King; and Olivia Lau. (2007) ``Anchors: Software for Anchoring Vignettes''. Journal of Statistical Software. Forthcoming. copy at http://wand.stanford.edu/research/anchors-jss.pdf

Wand, Jonathan and Gary King. (2007) Anchoring Vignetttes in R: A (different kind of) Vignette copy at http://wand.stanford.edu/anchors/doc/anchors.pdf

See Also

anchors

Examples

## data with zeroes as missing values in responses
data(poleff)
## data with NA missing values in responses
data(poleffna)

## convert NA to 0:
dd  <- replace.value(poleffna,c("xsayself","xsay1","xsay2","xsay3","xsay4","xsay5"))

## convert 0 to NA:
dd2 <- replace.value(poleff,c("xsayself","xsay1","xsay2","xsay3","xsay4","xsay5"),0,as.double(NA))