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 contingencyin
 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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