The Element of Time
If you have collected data over any given time period I’d suggest that you plot it in what is called an x or individuals chart over time and see what you see in patterns there. In fact many times I...
View ArticleHow to build a good Histogram
Although most statistical or spreadsheet software can create a histogram for you very easily I am going to talk you through how to create a good histogram by hand.
View ArticleControl Charts; A last resort control system.
Control charts are the most difficult of the seven basic quality tools to use. They are seldom the method of choice. When a process step is important, we would prefer that the step not vary at all....
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