Introduction, 639. — Factor analysis, 639. — Discriminant analysis, 644.

that the size coefficient (i8jl) was statistically significant at the 0.05 level in thirty-five of the 118 industries examined.6 The results for these industries are reported in table 1. The range of variation in the magnitude of i,/3 is considerable; the high, in Perfume and Cosmetics, is 0.114, and the low, 0.014, is found in Men's Clothing. The mean coefficient for the thirty-five industries is 0.0405 suggesting that on the basis of this group one would expect the rate of return to rise by 1.2 per cent if size doubles, and by 4.05 per cent for a ten-fold increase in size. VI Conclusions