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REFERENCES CITED

  • Blalock, H. M. 1960 Social statistics. New York, McGraw-Hill (in press).
  • Driver, H. E. and W. C. Massey 1957 Comparative studies of North American Indians. Philadelphia, The American Philosophical Society.
  • Simon, H. A. 1954 Spurious correlation: a causal interpretation. Journal of the American Statistical Association 49:467479.