APPENDIX 



Numerically, the accuracy of a regression coefficient is its standard 

 error multiplied by the appropriate M t M for a particular probability. That 

 is 



Accuracy of b ■ x (t) 



\ loo 



V 



n 



N 



where s 



y.x 



standard error of estimate, 



2/ 



or the square root of the mean 

 square of weighted residuals 

 from regression. In formula, its 

 square is 



i[—y j - b 



n-1 



and 



the correction factor for finite 

 populations in which "n" is the 

 number of units in the sample and 

 "N" the number in the population. 



The accuracy of "b" expressed as a ratio to "b" is 



E = Accuracy of b 

 b 



or Eb = Accuracy of b . 



2J Schumacher, F. 

 and range management, 

 illus. 1954. 



X. , and Roy A. Chapman. Sampling methods in forestry 

 Duke Univ. School of Forestry Bui. 7, rev., 222 pp., 



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