---
title: When taking the reference weeks to calculate, where are these weeks coming from?
description: Do we take the reference weeks from the selling perimeter we select, or from the whole history of the products?
---

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# When taking the reference weeks to calculate, where are these weeks coming from?

## Do we take the reference weeks from the selling perimeter we select, or from the whole history of the products?

The reference weeks are the weeks where the comparables selected have had stock and sales in all the stores.

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