A shorter method for computing coefficients of correlation and of regression and the correlation ratio.
[By] Leonard P. Ayres ...
|Main Author:||Ayres, Leonard Porter, 1879-1946|
Bloomington, Ill., Public School Publishing Co., c1920.
"Reprinted from the Journal of educational research for March-June, 1920".
 p. incl. tables.
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||University of Chicago|