---
title: Rolling Averages
description: Some Megalytic charts can display rolling averages of data. For example, below is a chart produced from the Rolling Average Comparison widget.
---

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# Rolling Averages

## Some Megalytic charts can display rolling averages of data. For example, below is a chart produced from the Rolling Average Comparison widget.

![traffic-trend-1024x536](https://resources.tapclicks.com/hubfs/traffic-trend-1024x536.jpg)

In this chart, the blue bars show the weekly number of total visits. The red line shows the 90-day rolling average of weekly visits. While the weekly visits bounce up and down, the 90-day rolling average is smoother – providing a better idea of the long term trend in traffic.

A 90-day rolling average (sometimes called a moving average) is simply the average taken over the last 90-days. A good explanation of how rolling averages are useful in web analytics can be found in this article: [The Math Behind Web Analytics](http://www.cardinalpath.com/math-and-web-analytics-moving-average/).

Many analysts compute rolling averages in Excel (as described in that article). Megalytic does that for you. 

You can customize the period used in the rolling average (e.g., 30-day, 90-day, 180-day, etc.) from inside the widget editor. First, open the editor by clicking on the edit icon in the upper-left corner of the chart, as shown below.

![rolling-avg-edit](https://resources.tapclicks.com/hubfs/rolling-avg-edit.jpg)

When the widget editor opens, you will see a select box that lets you change the period for the rolling averages.

![rolling-avg-selector](https://resources.tapclicks.com/hubfs/rolling-avg-selector.jpg)

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