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SPC or sampling control
When carrying out a production inspection, the question often arises as to the type of inspection. Which module should I use, SPC or IQC (inspection by sampling)? To...
5 common SPC mistakes
Implementing SPC in production is anything but self-evident... SPC is already well known in the industry, with the first control cards having been introduced as early as...
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....
Does SPC still have a place in our workshops?
For over forty years, SPC has been an integral part of the production environment. It is the method by which manufacturing processes are monitored by...
Inbound inspection: how to optimize it?
An incoming inspection plan is used to decide on the acceptance of a batch on the basis of samples taken from the batch. Several types of sampling are taken into account in order to...
5 tips for setting up sample testing
The quality of a product depends to a large extent on the quality of its components. And yet, it's still very common to see large industrial companies sourcing components...
How to calculate Cp, Pp, Ppk
In this article we'll look at how to calculate the different 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...