# Optimum EWMA control chart

> Optimum EWMA control chart (iPhone/iPad app by Francisco Aparisi.)

- Source: https://appshunter.io/ios/app/optimum-ewma-control-chart/id1088666755 (this page in markdown: same URL + `.md`)
- Developer: [Francisco Aparisi](https://appshunter.io/developer/1084055472)
- Category: Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 19 MB
- Languages: English
- Released: 2016-03-04
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/optimum-ewma-control-chart/id1088666755/reviews.md

## What is Optimum EWMA control chart?

This application is designed to:

1.- To calculate the ARL of a EWMA control chart given its parameters and makes a comparison versus the standard Shewhart (Xbar) control chart.

2.- To find the best parameters (optimization) to reach a given in-control ARL and to minimize the out-of-control ARL for a given shift.

3.- To plot an ARL chart, showing a comparison of performance versus the standard Xbar control chart.

In this application d = (m1 - m0) / sigma0.  And r = sigma1 / sigma0

The available languages are Spanish and English.

There is a twin application for OS X available in its store.


## Version history (last 1 release)

### 3.1 — 2020-12-03

Solved a bug when computing the ARL of the equivalent Xbar chart when there is a shift in the variability.

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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)
- [ARL Xbar Control Chart](https://appshunter.io/ios/app/arl-xbar-control-chart/id1085519193)
- [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)

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.*