The similarity between two clusters i and j is calculated as follows:

| Term | Description |
|---|---|
| sij | similarity between clusters i and j |
| dij | distance between clusters i and j |
| dmax | If you entered the original distance matrix D, dmax is the maximum value in the original distance matrix, D. If D was calculated from data, then dmax = 2 if you selected correlation as the distance measure and 1 if you selected absolute correlation. |