ratio

proportion

magnitude relation quantitative relation

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