beta coefficient
From Longman Business DictionaryRelated topics: Finance, Statisticsbeta coefficientbe‧ta co‧ef‧fi‧cient /ˈbiːtə kəʊəˌfɪʃəntˈbeɪtə koʊ-/ (also beta factor, beta) noun [singular] FINANCESTATISTICSa measurement of the amount of change in a share price over a period of time, compared with the average amount of change in all share prices