# Tag Info

• 57.1k
Accepted

### three sigma vs six sigma

Exactly, it's related to the number of sigmas to reach the LSL/USL from the mean of the distribution B compared to distribution A. There is an excerpt from the Wikipedia page that explains this fairly ...
• 1,043
Accepted

### Using standard deviation to calculate Control Limits for Individual Control Chart

The NIST Chapter on "Process or Product Monitoring and Control" is a useful reference on this topic. As explained there, it often is preferable to use estimates of $\sigma$ based on the ...
• 98.1k
Accepted

### How many values should one validate to achieve a desired confidence?

There are a few ways to think about this. If you want to use the confidence interval approach, then you should also look at the "finite population correction" (Googling for that phrase ...
• 52.4k

### Difference between anomaly detection and data quality check

This is such a difficult question to answer because 'data quality checks' is so broad, and even the definition of anomaly detection is not completely clear. Moreover, to give the best suggestions we ...
Accepted

### Correct setup for a Bayesian gamma model

Yes, you are correct. To confirm, I downloaded the 2021—2022 data for Table B6: Rates of patient mortality after listing. (The healthcare application is organ transplantation.) The expected & ...
• 10.5k
1 vote

### Statistical Quality Control Data Gathering

As far as using your data for standard quality control methods which require that you have Gaussian data, the results of your tests confirm that you are currently unable to reject the null hypothesis ...
• 1,622
1 vote

### Statistical Quality Control p-chart

As long as the sample size is consistent, you should be using an $np$ chart instead of a $p$ chart. The rest of your approach would be appropriate for solving this type of problem. There is the \$ ...
• 1,622
1 vote
Accepted

### Control Chart - Descriptive or Inferential?

"The control chart method for variables is a means of visualizing the variations that occur in the central tendency and dispersion of a set of observations." D.H. Besterfield, Quality Control, ...
• 1,622

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