The probability for each observation and each group is calculated from the squared distance using the following formula:

To normalize the probabilities to sum to 1, Minitab uses the following formula:

| Term | Description |
|---|---|
| d (k, i) | squared distance for group k and observation i |
| p (k, i) | probability for group k and observation i |
| dmin (i) | smallest squared distance for observation i over groups |