---
title: How does Nextail do ROS calculation?
description: In order to get a ROS value by week by cluster, the performance index must be recontextualized.
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# How does Nextail do ROS calculation?

## In order to get a ROS value by week by cluster, the performance index must be recontextualized.

This is achieved by applying the effects that were removed to get the ROS by cluster, namely Performance index x Performance in cluster 1 x Trend x Seasonality. The ROS by cluster is then multiplied by the number of stores in the cluster to get the quantity by cluster.

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