---
title: "Metrics that don't have statistical values"
slug: "metrics-that-dont-have-statistical-values"
updated: 2024-01-10T15:37:47Z
published: 2024-01-10T15:37:47Z
---

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

# Metrics that don't have statistical values

When creating performance charts, some metrics will not be displayed with statistical value options (e.g. percentiles) under the chart summary. Metrics that are binary, such as **Availability**, and metrics that are composed of other metrics, such as **Time to First Byte**, will not be able to display percentiles. These metrics will stay at their default statistical value, which is **Average**.

The reason for this behavior is that Catchpoint calculates data on the fly based on the user's filters and trimming options. Calculated data is never stored and is aggregated only when the user draws the performance chart. In this case, performance is unhindered because the system does not have to spend time retrieving calculated data from a database.

Below is the list of metrics that cannot display percentile statistical values:

- # Content Load Errors
- # JS Errors per Page
- % Ping Packet Loss
- Downloaded Bytes
- File Size
- Lighthouse Score
- Send (ms)
- Throughput
- Total Downloaded Bytes
- Webpage Throughput