beta coefficient
noun [ C, usually singular ]
ukus(also beta factor); (also beta) FINANCE, STOCK MARKET
a measurement of how much the value of a particular share has changed in a particular period of time, compared to the average change in the value of shares in the stock market as a whole during that period:
Standard and Poor's quoted the company's beta coefficient as 1.45.
A fund with a high beta coefficient gives greater returns in a rising market.