D
Dan Armstrong
Multi-variable control charts?
Is it possible to use control charts to trend data for multiple dependent variables?
I need to trend the water conductivity for a purified water system, which wouldn't normally be a problem, except the specifications (USP - US Pharmacopeia) state that the conductivity measurement cannot be temperature compensated. The conductivity limit varies directly with increasing temperature.
How can I trend the data when the limit for one variable changes based on another variable?
Is it possible to use control charts to trend data for multiple dependent variables?
I need to trend the water conductivity for a purified water system, which wouldn't normally be a problem, except the specifications (USP - US Pharmacopeia) state that the conductivity measurement cannot be temperature compensated. The conductivity limit varies directly with increasing temperature.
How can I trend the data when the limit for one variable changes based on another variable?