betting odds quantitative relation mileage IQ profit margin signal-to-noise ratio gasoline mileage haematocrit margin of profit magnitude efficiency loss ratio P/E ratio average Mach number signal/noise mechanical advantage quotient refractive index cranial index abundance magnitude relation intelligence quotient hematocrit odds order of magnitude proportionality signal/noise ratio cephalic index I.Q. productivity employee turnover load factor speed index of refraction time constant facial index aspect ratio f number price-to-earnings ratio factor of safety stop number prevalence reflective power relative humidity magnification packed cell volume safety factor gas mileage respiratory quotient S/N loading signal-to-noise fuel consumption rate stoichiometry gross margin relative frequency frequency albedo turnover rate output-to-input ratio breadth index focal ratio turnover eccentricity

magnitude relation quantitative relation proportion