> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uselayers.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Analytics metrics glossary

> What each Layers metric measures, how it differs from Shopify's numbers, and when new data shows up.

Layers reports most search and browse metrics **per search or browse request**, not per store visit. That's the main reason Layers numbers don't line up with Shopify's conversion rate.

## Engagement and conversion

| Metric | What it measures |
| - | - |
| **CTR** (click-through rate) | The share of searches where the shopper clicked at least one product. |
| **ATC rate** (add-to-cart rate) | The share of searches that led to at least one add to cart. |
| **Purchase rate** | The share of searches that led to an order. |
| **CVR** (conversion rate) | The share of **clicked** searches that led to an order. Because it only counts searches with a click, it's usually higher than purchase rate. Experiments call this click-to-order rate. |
| **Session conversion rate** | The share of browsing sessions with a purchase. This is the closest Layers metric to Shopify's online store conversion rate. |

Mobile apps don't send click or purchase events, so Layers leaves app requests out of CTR, ATC rate, purchase rate, and CVR rather than counting them as searches with no clicks.

## Revenue

| Metric | What it measures |
| - | - |
| **AOV** (average order value) | Attributed revenue divided by attributed orders. |
| **RPI** (revenue per impression) | Attributed revenue divided by tracked searches, leaving out mobile app searches. |
| **Revenue per session** | Sales divided by browsing sessions. In experiments, Layers counts only revenue attributed to each group's sessions, so unrelated orders don't count. |
| **Average selling price** | Total sales divided by units sold. |

Layers splits credit for a sale between the searches, collections, and blocks that led to it. See [Blended attribution](https://docs.uselayers.com/platform/metrics.md#blended-attribution) and [Attributed Sales versus Attributed Revenue](https://docs.uselayers.com/platform/metrics.md#attributed-sales-versus-attributed-revenue).

## How Layers numbers differ from Shopify

* **Different denominators.** Shopify's conversion rate is sessions with an order divided by store sessions. Layers' CVR counts clicked searches that led to an order, and purchase rate counts searches that led to an order, so a single visit with three searches can count three times.
* **Attributed, not total, sales.** Layers revenue metrics only include orders it can connect to a search, collection view, or block. Use Shopify for total store sales.
* **Order timing.** Layers imports Shopify orders once a day, so revenue metrics can trail Shopify by up to a day.

## When data shows up

* Storefront events such as impressions, clicks, and add to carts usually appear within the hour.
* Orders and revenue appear after the next daily Shopify order import.
* Attribution is recalculated every four hours.

If the **Analytics Delay** banner appears, events are still catching up. See [Data freshness](https://docs.uselayers.com/platform/metrics.md#data-freshness).

## Where to find each metric

* **Search terms, collections, and blocks:** the [analytics dashboards](https://docs.uselayers.com/help/analytics/dashboards.md) and their drill-down panels.
* **Individual blocks:** [View block performance](https://docs.uselayers.com/help/blocks/view-performance.md).
* **Merchandising rules:** [View rule performance](https://docs.uselayers.com/help/merchandising/view-rule-performance.md).
* **Sort order tests:** the **Results** tab of an [experiment](https://docs.uselayers.com/help/sort-orders/experiments.md#read-the-results).

## Next steps

* [Reports](https://docs.uselayers.com/platform/metrics.md) to build and save your own metrics.
* [Metric recipes](https://docs.uselayers.com/platform/metrics/recipes.md) for ready-made reports.
* [Shopify search reports after switching to Layers](https://docs.uselayers.com/help/analytics/shopify-search-reports.md).