4_. THEORY OF STATISTICS. 
West, C. J., refs., Introduction to istic lines (lines of regression), 177 ; 
Mathematical Statistics, 397. problem of pauperism, 192 ; data 
Westergaard, H., refs., Theorie der cited from, 78, 93, 122, 140, 163, 
Statistik, 6, 273, 361. 185; facing 186, 259, 385. Refs., 
Whipple, G. C., refs., Vital Statistics, history of words * statistics,” 
398. “ statistical,” 5; attributes, asso- 
Whitaker, Lucy, ref., law of small ciation, consistence, etc., 15, 23, 
numbers, 273. 39, 40, 57 ; isotropy, influence of 
Whittaker, E. T., refs., Calculus of bias in statistics of qualities, 73 ; 
Observations, 397. correlation, 188, 226, 252, 392; 
Wicksell, S. D., refs., correlation, correlation between indices, 226 ; 
391-392. frequency-curves, 314, 394 ; prob- 
Willcox, W. F., citation of Bielfeld, 1. able errors, 355, 395 ; pauperism, 
Wolfenden, H. H., mortalities and 130, 208, 253 ; birth-rates, 208, 
death-rates, ref., 392. 226 ; sex-ratio, 273 ; fluctuations 
Wood, Frances, refs., index-correla- of sampling in Mendelian ratios, 
tions, 226, 252; index-numbers, 273 ; time-correlation problem, 
390. 392; application of law of small 
Wood, T. B., refs., errors of agricul- chances, 393 ; goodness of fit in 
tural experiment, 396 ; variation association and contingency- 
in mangels, 396. tables, 394 ; yield trials, 396. 
Working classes, cost of living, refs., 
390-391. ZIMMERMANN, E. A. W., use of the 
words ‘‘ statistics,” ‘ statistical,” 
Young, ALLYN A., refs., age statis- in English, 1. 
ties, 105. Zimmermann, H., multiplication 
Young, Andrew, refs., probable error table, 358. 
of coefficient of contingency, 395. Zizek, F., refs., Die statistischen Mit- 
Yule, G. U., use of term character- telwerthe and translation, 129. 
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