386 



MARINE FISHERIES OF NORTH CAROLINA 



1920 1922 1924 1926 1928 1930 1932 1934 1936 1938 1940 



3000 



2000 



3000 



2000 



1920 1922 1924 1926 1928 1930 1932 1934 



1938 1940 



Fig. 9. Index of Industrial Production of the United States compared with total food fish 

 production seven regions of the United States and with landings of New England vessel 



The correlation coefficient of fish production and the industrial index, as they stand, is r 

 fisheries. 



The correlation coefficient of fish production and the industrial index, as they stand, is r 

 = + 0.74; the two curves diverge toward the right, indicating greater upward secular trend of 

 fish than of industrial production, traceable to the introduction of filleting and other marketing 

 improvements beginning in 192 1, especially noticeable 4n the curve of vessel fisheries of New 

 England where most of the improvement occurred. If the food fish curve is so adjusted as to 

 remove the excess of this secular trend, its correlation coefficient with industrial production 

 becomes r ^ + 0.82. 



