The goal of this tutorial is to learn how to change the name of the levels of a factor.
# First of all we load the data
# For this tutorial we are going to use the iris plant dataset
data(iris)
str(iris)## 'data.frame': 150 obs. of 5 variables:
## $ Sepal.Length: num 5.1 4.9 4.7 4.6 5 5.4 4.6 5 4.4 4.9 ...
## $ Sepal.Width : num 3.5 3 3.2 3.1 3.6 3.9 3.4 3.4 2.9 3.1 ...
## $ Petal.Length: num 1.4 1.4 1.3 1.5 1.4 1.7 1.4 1.5 1.4 1.5 ...
## $ Petal.Width : num 0.2 0.2 0.2 0.2 0.2 0.4 0.3 0.2 0.2 0.1 ...
## $ Species : Factor w/ 3 levels "setosa","versicolor",..: 1 1 1 1 1 1 1 1 1 1 ...# We can obtain the levels of the plants
levels(iris$Species)## [1] "setosa" "versicolor" "virginica"# We can now rename the levels
levels(iris$Species) <- c("Plant 1", "Plant 2", "Plant 3")
# And check the new levels
levels(iris$Species)## [1] "Plant 1" "Plant 2" "Plant 3"In this tutorial we have learnt how to rename levels of a factor.