Your process should be stable and the original (or transformed) process data should follow a normal distribution. The control charts and probability distribution plot help you to evaluate whether these requirements are met.
Determine whether your process is stable
Control charts help you monitor the stability of your process by identifying out-of-control points and patterns and trends in your data.
Red points indicate observations that fail at least one of the tests for special causes and are not in control. Out-of-control points indicate that the process may not be stable and that the results of a capability analysis may not be reliable. You should identify the cause of out-of-control points and eliminate special-cause variation before you analyze process capability.
The type of control chart that Minitab displays for the Chart of All Data depends on the subgroup size. If the subgroup size is 8 or less, Minitab displays an R chart. If the subgroup size is 9 or more, Minitab displays an S chart.
Assess the normality of the data
Use the normal probability plot to assess the requirement that your data follow a normal distribution.
If the normal distribution is a good fit for the data, the points form an approximately straight line and fall along the fitted line that is located between the confidence bounds. Departures from this straight line indicate departures from normality. If the p-value is greater than 0.05, you can assume that the data follow the normal distribution. You can evaluate the capability of your process using a normal distribution.
If the p-value is less than 0.05, your data are not normal and the capability analysis results may not be accurate. Use Individual Distribution Identification to determine whether you must transform the data or fit a nonnormal distribution to perform the capability analysis.
If your data are nonnormal, you can use the Transform option included in this analysis to transform the data. To fit a nonnormal distribution to your data, use Nonnormal Capability Sixpack.
Step 2: Examine the observed performance of the process
Use the capability histogram to visually examine the sample observations in relation to the process requirements.
Examine the process spread
Visually examine the data in the histogram in relation to the lower and upper specification limits. Ideally, the spread of the data is narrower than the specification spread, and all the data are inside the specification limits. Data that are outside the specification limits represent nonconforming items.
To determine the actual number of nonconforming parts in your process, use the results for PPM.
Assess the center of the process
Evaluate whether the process is centered between the specification limits or at the target value, if you have one. The center of the data occurs at the peak of the distribution curve and is estimated by the sample mean.
Step 3: Evaluate the capability of the process
Use the main capability indices to evaluate how well your process meets requirements.
Assess between/within capability
Use Cpk to evaluate the between/within capability of your process considering both its location and spread. In general, higher values indicate a more capable process. Lower Cpk values indicate that the process may need improvement.
Compare Cpk with a benchmark that represents the minimum value that is acceptable for your process. Many industries use a benchmark value of 1.33. If Cpk is lower than your benchmark, consider ways to improve your process, such as reducing its variation or shifting its location.
Compare Cp and Cpk. If Cp and Cpk are approximately equal, then the process is centered between the specification limits. If Cp and Cpk differ, then the process is not centered.
Assess overall capability
Use Ppk to evaluate the overall capability of your process based on both the process location and the process spread. Overall capability indicates the actual performance of your process that your customer experiences over time.
Generally, higher Ppk values indicate a more capable process. Lower Ppk values indicate that your process may need improvement.
Compare Ppk to a benchmark value that represents the minimum value that is acceptable for your process. Many industries use a benchmark value of 1.33. If Ppk is lower than your benchmark, consider ways to improve your process.
Compare Pp and Ppk. If Pp and Ppk are approximately equal, then the process is centered between the specification limits. If Pp and Ppk differ, then the process is not centered.
Compare Cpk and Ppk. If Ppk is considerably greater than Cpk, there may be other sources of systemic variation in the process, in addition to the variation between and within the subgroups.
The Cpk and Ppk indices measure the capability of the process in relation only to the specification limit that is closest to the process mean. Therefore, these indices represent only one side of the process curve, and do not measure how the process performs on the other side of the process curve. If your process has nonconforming items that fall outside both specification limits, use additional capability measures to more fully assess process performance.