SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 30:269-272 (1966)
© 1966 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Selection of Characteristics for Numerical Classification of Soils1

P. K. Sarkar, O. W. Bidwell and L. F. Marcus2

ABSTRACT

Eighteen hundred and thirty product-moment correlation coefficients were used to select characteristics from 61 given soil characteristics for numerical classification by electronic computer of 26 soils representing nine Orders of the new soil classification system (7th Approximation). Correlated characters were eliminated successively to 51, 40, 33, and 22 soil characteristics according to decreasing levels of the product-moment correlation coefficient over soils.

The correlation method is an objective procedure for eliminating members of groups of similar characteristics that might produce undue weighting in the numerical classification. It is superior to the heretofore used, and often criticized, method of selection based on subjective evaluation of the characteristics in soil classification.

NOTES

1 Contribution No. 928, Department of Agronomy and no. 99, Department of Statistics and Statistical Laboratory, Kansas Agri. Exp. Sta., Kansas State University, Manhattan. Partial support from the University's Bureau of General Research and its Research Coordinating Council is acknowledged. Presented before Div. S-5, Soil Science Society of America, Kansas City, Mo., Nov. 19, 1964.

2 Graduate Student, Agronomist, and Associate Professor of Statistics, respectively.

Received for publication May 28, 1965. Accepted for publication January 11, 1966.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1966 by the Soil Science Society of America.