obtained by taking the difference between the largest and the smallest values in a data set.
Note: 1. range = largest value - smallest value;
2. range is not a satisfactory measure of dispersion because it is influenced by outlier s, and because it is only based on two values.
3. bins or buckets; there is a distance beyond which there are no more geographic surprises, this distance is known as the range , and the value of difference at this distance as the sill ;
4. in the semivariogram, the range is also the distance where the fitted semivariogram(model line) levels off.