> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sourcemedium.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# The YoY Performance Module
> Overview of the YoY Performance module and how to use it.
#### What is the YoY Performance module and what data can be found there?
* Blended view of all your integrated data sources
* This is where you will find insights into previous periods for comparison over time views
#### Common Questions & Insights That Can Be Answered Here:
#### Potential Reporting Differences & Discrepancies
The YoY module uses the Executive Summary data source, which is designed to mirror the accounting rules present in the Shopify Sales Report, and will almost always match 1:1. However, there are some instances where you won't see a 1:1 match:
1. If your brand has our 'Exclude \$0 Orders' feature enabled, you will see a revenue and orders mismatch. This feature excludes otherwise-valid orders with a net revenue of \$0 from all Executive Summary and Retention dashboard data.
* [See here for a deeper explanation of this feature.](/help-center/faq/dashboard-functionality-faqs/what-is-exclude-zero-dollar-feature)
2. If your brand has any data cleaning rules in the Channel Mapping tab your Configuration Sheet *(e.g. any rules routing orders to a channel other than Online DTC)* you will see a mismatch if only Online DTC is selected in the channel dropdown (located at the top right-hand corner of your report, under the date range filter).
**If you are running sales through Amazon, be sure to deselect "Amazon" in the channel dropdown when comparing sales data between the Executive Summary and Shopify Sales report.**