In statistics, if we have a set of observations expressed in numbers (for example, lengths of trees in meters, weights of animals in kilograms and so on), then the difference between maximum and minimum is called **range**.

Range is useful if data is distributed more or less uniformly (between the minimum and the maximum).

For periodic functions, *half* of the difference between maximum and minimum is called **amplitude**. For example, the function `f(x)=1+2sin(x)` has the amplitude `2,` while its maximum is `3,` its minimum is `-1` and their difference is `4.`