R Programming Fundamentals

Creating an Ordered Factor Variable

Herein, we will create an ordered factor variable in a dataset. In order to do so, the following steps need to be executed:

1. Create a vector called gas_price using the following code:

gas_price <- rep(c("low", "medium", "high"), times = 146)gas_price <- gas_price[-1]

It will indicate if gas prices in that area are low, medium, or high on average.

2. Add the gas_price variable to the midwest dataset as follows:

midwest$gas_price <- factor(gas_price,                        levels = c("low", "medium", "high"),                        ordered = TRUE)

3. Verify that the variable has been added to the dataset successfully using table() as follows:

table(midwest$gas_price)

Factor variables are a very important data type in R, since, as we learned previously, ...