Star rating system

This rating system is validated expression for indicating relative performance of service package that a 5-stars award to the best 10% samples for IEQ, 4 stars to the next 22.5%, 3 stars to the next 35%, 2 stars to the next 22.5% and 1 star to the worst 10%.

Further information:

Blume ME, 1998. An anatomy of Morningstar ratings, Financial Analysts Journal 54(2)19-27.