Exercise

# Comparing the data set

In addition to simple mathematical operators like subtraction and division, you can ask R to make comparisons: greater than with `>`

, less than with `<`

, and equality with `==`

.

For example, we can ask if boys outnumber girls in each year with the expression `present$boys > present$girls`

(Try it by typing it into the console). This command returns 63 values of either `TRUE`

if that year had more boys than girls, or `FALSE`

if that year did not.

This output shows a different kind of data than we have considered so far. In the `present`

data frame our values are numerical (the year, the number of boys and girls). Here, we've asked R to create logical data, data where the values are either `TRUE`

or `FALSE`

. This is called a **boolean value**. In general, data analysis will involve many different kinds of data types, and one reason for using R is that it is able to represent and compute with many of them.

Instructions

**100 XP**

- Try the expression
`present$boys > present$girls`

. - Inspect the result.