In statistics, the range is a measure of variability that describes the difference between the largest and smallest values in a set of data). It is calculated by subtracting the smallest value from the largest value. The range is expressed in the same units as the data). The range is the simplest measure of variability and is most useful in representing the dispersion of small data sets). However, it can be misleading when there are extremely high or low values, as it does not take into account the data points between the two extremities of the distribution. In such cases, other measures of variability, such as the interquartile range or standard deviation, may be more appropriate. The range has a significant role in describing the variability of a data set, as long as there are no outliers. An outlier is an extreme high or low value that stands alone from the other values. If an outlier exists, the value of the range by itself can be misleading.