Specify Mean and Control Limits for Statistcal Process Control Chart
I am using the SPC chart card and would like to specify (not actively calculate) the control limits and average for our process. It doesn't make sense to automatically generate these based on the data set as that will hide mean and variance shifts in our process which is what we are using the chart to detect. We have historical baseline data which we use to compute the mean and control limits for our Shewart x_bar and S charts (see: https://en.wikipedia.org/wiki/X%CC%85_and_s_chart and https://www.itl.nist.gov/div898/handbook/pmc/section3/pmc32.htm). I see that it's possible to add lines to some other charts, but it doesn't look like it can be controlled in this card. I would like to keep using this card as it has the rule violation highlighting built-in, but without being able to fix those lines the chart isn't very useful for manufacturing control. Any one have any idea how to do this/know if it's possible?