by Juan Olano | Nov 14, 2019 | Uncategorized
What is the difference between specification limits and control limits? This is a crucial distinction that is frequently confused. Basically, specification limits have to do with the voice of the customer while control limits have to do with the voice of the process....
by Juan Olano | Nov 14, 2019 | Uncategorized
How do I test my data for normality? Before applying statistical methods that assume normality, it is necessary to perform a normality test on the data. Figure 1: Histogram depicting a normal (bell-shaped) distribution in WinSPC For example, all of the following...
by Juan Olano | Nov 14, 2019 | SPC
What is the relationship between process stability and process capability? Nothing and everything. Though they are not directly linked, statistician and SPC expert Steven Wachs cautions that without evidence of process stability, capability data is useless. Process...
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