Computation and Interpretation of Multiple Regressions
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Summary Full practical directions are given for the expeditious calculation of regression equations, which are built up by successive insertion of additional variates. The computer can readily measure the contribution made by each new variate to the goodness of fit, omit variates which do not make a significant contribution, and select that group of independent variates which together give the lowest residual mean square in the dependent variate. The statistical properties of the regression equation, and of the successive reciprocal matrices from which it is derived, are discussed in detail, with special reference to the proper interpretation of the equation and its associated tests of significance. In dealing with experimental or observational data it is rarely necessary to work to more than four or at most five significant figures.