This application simulates the Xbar and S control charts, that are someof 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.

In addition, it measures the number of times that each control chart shows an out-of-control alarm. For example, it is possible to see that the Xbar control chart detects sigma shifts too.

On the other hand, there is a tab where it sis possible to simulate the effect of the errors in the estimation of the mean and sigma during Phase I (real in-control and out-of-control ARLs)

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

At this moment the application languages are Spanish and English.

What’s New

Version 2.0

This app has been updated by Apple to use the latest Apple signing certificate.

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

App Privacy

The developer, Francisco Aparisi, has indicated that the app’s privacy practices may include handling of data as described below.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary based on, for example, the features you use or your age. Learn More


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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