For these exercises we will use the US murders dataset. Make sure you load it prior to starting.

library(dslabs)
data("murders")

The function table takes a vector and returns the frequency of each element.

Example

# The "c" in `c()` is short for "concatenate," which is the action of connecting items into a chain
# The function `c()` connects all of the strings within it into a single vector, which we can assign to `x`
x <- c("a", "a", "b", "b", "b", "c")
# Here is an example of what the table function does
table(x)

#> x
#> a b c
#> 2 3 1

You can quickly see how many states are in each region by applying this function.

Exercise