A rate developed solely for the evaluation of incidence rates determined by taking the sum of a reporte's prior rates and the industry prior rates, and dividing by two. (Bul T5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}