# XBar control chart with VSS

> XBar control chart with VSS (iPhone/iPad app by Francisco Aparisi.)

- Source: https://appshunter.io/ios/app/xbar-control-chart-with-vss/id1085694274 (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 · 42 MB
- Languages: English
- Released: 2016-02-23
- Data updated: 2026-06-10
- User reviews in markdown: https://appshunter.io/ios/app/xbar-control-chart-with-vss/id1085694274/reviews.md

## What is XBar control chart with VSS?

This application computes the ARL (Average Run Length) of a Xbar control with variable sample size (VSS).

In addition, it performs an optimization of the parameters (warning limit, control limits and the two sample sizes) in order to minimize the out-of-control ARL.

It draws the ARL curves to compare the performance of the standard Xbar chart and the Xbar with VSS.

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

At the moment the supported languages are Spanish and English.


## Version history (last 1 release)

### 3.2 — 2016-12-12

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

Better screen resolution for iPads

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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)
- [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 2026-06-10.*