What inspired this wish list request? I have been using the CUSUM platform more and have found that there are some gaps between it and other Control Chart platforms that can make the user experience frustrating.
What is the improvement you would like to see?
- Have ARL show Shewhart ARL like the EWMA platform
- Have options to highlight out of control rows in the red drop down menu
- Have an option to add an out of control row indicator column in the red drop down menu
- Add stages option like control chart builder
- Add in I-MR/X Bar charts like in EWMA platform
- Add option to show k*sigma (from CUSUM) band on this chart. This will help show when points are adding or subtracting from the CUSUM totals
- Be able to use Local data filter and column switcher
- Be able to have CUSUM reset after a certain number of runs are within the K*sigma band
- This would allow the CUSUM control charts to quickly recover back to showing in control like we get with a EWMA chart
- Another option could be having the CUSUM reset after a "flag value" kinda like the EWMA will reset after a missing value or excluded row. So for example, 999.9 could be the reset value for positive sums and -999.9 could be the reset value for negative values. These could be set as a column property or as a entry from the red drop down menu.
- Have platform ignore excluded rows as a menu option red drop down menu (in case you forgot to click it in the set up menu)
- On ARL profiler, need to show what the ARL(Delta) is
- Would be great to be able to have the ARL (0) show as well, maybe as a second Y axis in the profiler, like when you fit multiple Y’s in Fit Model.
- Also would be great to be able to use the desirability function to find the best setting for a given ARL(0) and ARL (delta) for a set k value.
- Need to change the behavior of the ARL Profiler so that only the parameter of h or k is change when one of the values are updated in the Parameter control box. Right now if you change one it will change both, which is annoying if you are trying to update the parameter table to match the ARL profiler so that you can see all the ARL performance on the ARL table.
- Update the ARL profiler so that the values you can enter always return an ARL value
Why is this idea important?
The CUSUM control chart is getting more use but could use some additional updates to make it as functional as the Control Chart builder platform. Also, since the correct ARL value is critical for setting up the charts correctly more tools that get away from a guess and check workflow would be great.