Recode a Variable
Recodes a numeric vector, character vector, or factor
according to simple recode specifications.
is an alias for
recode that avoids name clashes
with packages, such as Hmisc, that have a
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numeric vector, character vector, or factor.
character string of recode specifications: see below.
return a factor; default is
an optional argument specifying the order of the levels in the returned factor; the default is to use the sort order of the level names.
arguments to be passed to
Recode specifications appear in a character string, separated by
semicolons (see the examples below), of the form
If an input value satisfies more than one specification,
then the first (from left to right) applies.
If no specification is satisfied, then the input value is carried
over to the result.
NA is allowed on input and output.
Several recode specifications are supported:
- single value
- vector of values
- range of values
7:9='C'. The special values
himay appear in a range. For example,
:is not the R sequence operator. In addition you may not use
:with the collect operator, so for example
c(1, 3, 5:7)will cause an error.
everything that does not fit a previous specification. For example,
else=NA. Note that
elsematches all otherwise unspecified values on input, including
If all of the output values are numeric, and if
FALSE, then a numeric result is returned; if
var is a factor,
then by default so is the result.
a recoded vector of the same length as
John Fox email@example.com
Fox, J. and Weisberg, S. (2011) An R Companion to Applied Regression, Second Edition, Sage.
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x<-rep(1:3,3) x ##  1 2 3 1 2 3 1 2 3 recode(x, "c(1,2)='A'; else='B'") ##  "A" "A" "B" "A" "A" "B" "A" "A" "B" Recode(x, "1:2='A'; 3='B'") ##  "A" "A" "B" "A" "A" "B" "A" "A" "B"
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