Method and a system for a statistical equivalence test

A system for testing statistical equivalence, the system comprising:

• a storing unit configured to store a reference statistical value according to a process variable and data characteristics and engineer experience information;
• an input unit configured to receive process data from at least one process equipment;
• and
• a decision unit configured to determine statistical equivalence by comparing the received process data with the reference statistical value by:
• first deciding if the received process data has equivalence, non-equivalence or improvement by comparing statistics of the received process data with reference statistics;
• correcting the reference statistics using a statistical tolerance for the process data that has the non-equivalence or improvement;
• second deciding if the process data that has the non-equivalence or improvement has acceptance or non-equivalence by comparing the process data that has the non-equivalence or improvement with the corrected reference statistics;
• third deciding if the process data that has the non-equivalence after the second deciding has acceptance or non-equivalence using an experiential technical tolerance of an engineer;
• and
• fourth deciding final equivalence of the process data based on the first to third decision results.

A method of performing a statistical equivalence test, the method comprising:

• first determining if process data has non-equivalence or improvement based on a comparison of a statistical value of the process data to a statistical value of reference data;
• adjusting the statistical value of the reference data;
• and
• second determining if the process data has non-equivalence by comparing the process data with non-equivalence or improvement to the adjusted statistical value of the reference data.