These two functions are used by `nnc`

to compute the
Numbers Needed for Change.

```
convert.d.to.nnc(d, cer, r = 1,
eventDesirable = TRUE,
eventIfHigher = TRUE)
convert.d.to.eer(d, cer,
eventDesirable = TRUE,
eventIfHigher = TRUE)
```

d

The value of Cohen's *d*.

cer

The Control Event Rate.

r

The correlation between the determinant and behavior (for mediated Numbers Needed for Change).

eventDesirable

Whether an event is desirable or undesirable.

eventIfHigher

Whether scores above or below the threshold are considered 'an event'.

The converted value.

These two functions are used by `nnc`

to compute the
Numbers Needed for Change.

Gruijters, S. L. K., & Peters, G.-J. Y. (2017). Introducing the Numbers Needed for Change (NNC): A practical measure of effect size for intervention research.

# NOT RUN { convert.d.to.eer(d=.5, cer=.25); convert.d.to.nnc(d=.5, cer=.25); # }