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What should I do if I get a bad Cpc?
What is Cpc: Cpc stands for Control Process Capability. It is used to identify whether a control process is capable of measuring a characteristic correctly, i.e. whether...
How do you choose the right problem-solving method?
For each type of problem, there's a suitable approach to solving it, so that the effort is proportional to the challenge. The different approaches are not in competition with each other, but complement each other....
How do you analyze a data table?
Often, when we want to understand how a process works, we find ourselves faced with a data table like the one below. In this example, we'd like to see what the...
Outlier testing
When analyzing a series of data, we are sometimes confronted with values that do not appear to be part of the normal distribution of the data....
How to calculate the capability indices Cp, Pp, Ppk
In this article, we'll look at how to calculate the various capability indices, in particular Cp, Pp and Ppk. To fully appreciate the capability of a process, the notion...
Parametric and non-parametric statistical tests
Before going into the details of parametric and non-parametric tests, let's review how statistical testing works. Ellistat's Data Analysis module enables you to perform these tests. A statistical test works...
Normality tests
To test normality, there are several tests that can be used to validate or invalidate the hypothesis that the distribution of parts follows a normal distribution. The tests most commonly used are...
What is the R&R pledge?
The R&R guarantee is used to qualify a measurement process. This means checking that the variability of the measurement process is compatible with the variability of the quantity to be measured. It...
Problem solving
When faced with a problem, you need to be able to identify what kind of problem it is. This enables you to adapt the right problem-solving method. It's...
Proof, tea and Fisher: the origin of experimental design
In the design of experiments in statistics, the lady drinking tea is a random experiment reported by Ronald Fisher in his book The Design of Experiments...
Taguchi's experimental design
The Taguchi experimental design is a statistical method used to improve the quality of products and manufacturing processes. Developed by Dr. Genichi Taguchi, it aims to...
Reliability, Weibull's law
Weibull's law is most often used to model reliability data. Ellistat's Data Analysis module makes it easy for you to perform these analyses. Definitions: Reliability,...