sivipm (version 1.1-4.2)

factorsplit: Transform Categorical Variables into Numeric Variables

Description

Transform each factor column of a dataframe into numeric variables.

• If the factor has more than 2 levels, it is split into as many 0-1 columns as levels. The value 1 is set on the lines where the factor is equal to the level, and 0 elsewhere.

• If the factor has one or two levels, the first level is coded -1 and the second one into +1.

The numeric columns are left unchanged.

Usage

factorsplit(data)

Arguments

data

Data.frame.

Value

The data.frame data, where the factor columns are replaced by 0/1 or +1/-1 columns. The labels of the added columns are the concatenation of the name of the factor and the name of the level, with the underscore separator.

See Also

crpolyX, vect2polyX

Examples

# NOT RUN {
a <- data.frame(V=1:3, color=c("red","green","black"),
                       temp=c("hot", "cold", "hot"))
b <- factorsplit(a)
# The columns in b are: V, color_red, color_green,  color_red, temp
# }