# ARL Xbar Control Chart

> ARL Xbar Control Chart (iPhone/iPad app by Francisco Aparisi.)

- Source: https://appshunter.io/ios/app/arl-xbar-control-chart/id1085519193 (this page in markdown: same URL + `.md`)
- Developer: [Francisco Aparisi](https://appshunter.io/developer/1084055472)
- Category: Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 8.0 · 45 MB
- Languages: English
- Released: 2016-02-23
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/arl-xbar-control-chart/id1085519193/reviews.md

## What is ARL Xbar Control Chart?

This application simulates the Xbar control chart, that is one of the tools of statistical quality control, or statistical process control (SPC). 

It computes by simulation the ARL for different mean and sigma shifts. Concretely, the shifts are measured by  d = (m1 - m0) / sigma0 and by r = sigma1 / sigma0.

The control limits can be placed at 2 or 3 sigma. In addition, it is possible to change the sample size.

In addition, the application simulates the real performance of the Xbar control chart (in-control and out-of-control ARLs) when parameters are estimated in Phase I. 

There is a twin application for OSX / MAc available in its store. The application is also available for other operating systems.

At this moment the application languages are Spanish and English.


## Version history (last 1 release)

### 1.3 — 2017-11-13

This app has been updated by Apple to display the Apple Watch app icon.

A new tab where it is possible to simulate the real performance of the Xbar control chart (in-control and out-of-control ARLs) when parameters are estimated in Phase I.

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## More apps by Francisco Aparisi

- [Power of Hypothesis Testing](https://appshunter.io/ios/app/power-of-hypothesis-testing/id1084055473)
- [Calculator Xbar and S Charts](https://appshunter.io/ios/app/calculator-xbar-and-s-charts/id1085185552)
- [XBar control chart with VSS](https://appshunter.io/ios/app/xbar-control-chart-with-vss/id1085694274)
- [ARL simulator EWMA control chart](https://appshunter.io/ios/app/arl-simulator-ewma-control-chart/id1088604146)
- [Optimum EWMA control chart](https://appshunter.io/ios/app/optimum-ewma-control-chart/id1088666755)

All apps by Francisco Aparisi: https://appshunter.io/developer/1084055472

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*