fact2dummy {StatMatch} | R Documentation |
Transforms a factor or more factors contained in a data frame with a set of dummy variables.
fact2dummy(data, all=TRUE, lab="x")
data |
A factor or a data frame that contains one or more factors (columns whose class is “factor” or “ordered”) that have to be substituted by dummy variables. |
all |
Logical. When all=TRUE (default) the output matrix will contain as many dummy variables as the number of the levels of the factor variable. On the contrary, when all=FALSE , the dummy variable related to the last level of the factor is dropped.
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lab |
A character string with the name of the variable to be pasted with its levels. This is used only when data is a factor. By default it is set to “x”.
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This function substitutes categorical variables in the input data frame (columns whose class is “factor” or “ordered”) with the corresponding dummy variables.
A matrix with the dummy variables instead of initial factor variables.
Marcello D'Orazio madorazi@istat.it
x <- runif(5) y <- factor(c(1,2,1,2,2)) z <- ordered(c(1,2,3,2,2)) xyz <- data.frame(x,y,z) fact2dummy(xyz) fact2dummy(xyz, all=FALSE) #example with iris data frame str(iris) ir.mat <- fact2dummy(iris)