How do I count defects in a process defined by multiple column means and standard deviations?
Data table is 180K rows. Data is operational recorded data for a steady state process. Four columns measure the pressure in four separate workstreams of the process. Four columns measure the time to create the pressure in the four separate workstreams of the process. For each workstream, its mean and standard deviation are required, for both pressure and time, to define a threshold. For each wo...