How to calculate the process capability of waiting time at check-in counter at airport?
The calculation of process capability depends on whether you are dealing with attribute or continuous data. This will depend on how you have set up and framed the process. In case of attribute data, you need to calculate the DPMO (defects per million opportunities); in the case of continuous data you need to calculate CpK as capability index. It is important to note that, in either case, you first need to check whether the process is in statistical control, as it would not make sense to measure the capability of a process that is not in control. To calculate process capability you need to know the specification limits provided from the customer: process capability is essentially the ratio of the spread between the process specifications (the specification “width”) to the spread of the process values, as measured by 6 process standard deviation units (the process “width”). A capable process is one where almost all the measurements fall inside the specification limits. On the more common
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