The prev next quantitation is an implementation of the Directionality index proposed by Dixon et al. (Nature doi:10.1038/nature11082). It provides a way to look for correlated domains within a HiC dataset. Domain boundaries are represented by sudden changes in the DI measure.
The measure itself looks at the relative strength of HiC interactions in windows upstream and downstream of each probe and produces a value which quantitates this.
The options you have for this module are: