Introduction
7. Comparison operators
Text values
Variables
Functions
Summary

## Instruction

Great job! Now, what if we want to compare the result of a calculation with some value? In R, comparisons are performed with the following operators:

• Greater than (>),
• Greater than or equal to (>=),
• Less than (<),
• Less than or equal to (<=),
• Equal to (==),
• Not equal to (!=).

When a comparison is made, R will return either TRUE or FALSE, which are called logical values. For example, if we would like to know if John's BMI is less than 30:

87/(1.90*1.90) < 30
R will return one of the following two values:

• TRUE if his weight in kilograms divided by his height (in meters squared) is less than 30.
• FALSE if his weight in kilograms divided by his height (in meters squared) is not less than 30 (which is equivalent to it being greater than or equal to 30).

## Exercise

If you know that Tanya is 1.72 m tall and weighs 65 kilograms, use R to check whether she would be classified as obese (BMI greater than 30).

The BMI formula is as follows:

weight/(meters*meters)