![]() ![]() ![]() These combination charts helps to understand the stability of processes and also detects the presence of special cause variation. It is actually a two plots to monitor the process mean and the process variation over the time and is an example of statistical process control. X bar R chart is used to monitor the process performance of a continuous data and the data to be collected in subgroups at a set time periods. Selection of appropriate control chart is very important in control charts mapping, otherwise ended up with inaccurate control limits for the data. X Bar R charts are the widely used control chart for variable data to examine the process stability in many industries (like Hospital patients’ blood pressure over time, customer call handle time, length of the part in production process etc.,). ![]()
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