# False negative rate difference

The false negative rate difference gives the percentage of positive transactions that were incorrectly scored as *negative* by the model.

## False negative rate difference at a glance

**Description**: Returns the difference in false negative rates for the monitored and reference groups**At 0**: Both groups have equal benefit.

## Do the math

The following formula is used for calculating false negative rate (FNR):

```
false negatives
False negative rate = __________________________
all positives
```

The following formula is used for calculating false negative rate difference:

```
False negative rate difference = FNR of monitored group - FNR of reference group
```

## Next steps

False positive rate difference

**Parent topic:** Fairness metrics overview