INDEX. 415
movements of two variables, 200, * Jacos, S. M., ref., crops and rainfall,
201. Refs., correlation between 208, 226.
movements of two variables, 208;  Jevons, W. Stanley, use of geometric
weather and crops, 208, 253; mean, 127. Refs., system of
_ theory of partial correlation, 252. numerically definite reasoning
Horticulture, errors in, refs., 396. (theory of attributes), 15; index-Houses,
 inhabited and uninhabited, numbers, 130; Pure Logic and
in rural and urban districts, 61-62; other Minor Works, 15; Investigaannual
 value of, table, 83: median, tions in Currency and Finance,
(qu. 4) 131; quartiles, (qu. 3) 155. 130.
Hudson, H. P., refs., frequency- Johannsen, W., Elemente der exakten
curves (epidemiology), 394. Erblichkeitslehre, 361.
Hull, C. H., ref., The Economic John, V., refs., Geschichte der Sta-Writings
 of Sir William Petty, tistik, 5.
together with the Observations on Jones, D. C., refs., 4 First Course in
the Bills of Mortality more probably Statistics, 397.
by Captain John Graunt, 6. J-shaped frequency - distributions,
Husbands and wives, correlation be- 98-102, 363-364.
tween ages, table, 159 ; diagram, Julin, A., refs., Principes de Statis-173
 ; constants, (qu. 3) 189. tique, 397.
Hypergeometrical Series, ref., 289.
KaprreEYN, J. C., refs., Skew Fre-ILLUSORY
 associations, 48-51. quency-curves in Biology and Sta-Imbecility,
 associations with deaf- tistics, 130, 314.
mutism, 32-33, 38. Kelley, T. L., refs., correlation, 392 ;
Inclusive and exclusive notations for Statistical Method, 397.
statistics of attributes, 14-15. Keynes, J. M., refs., 4 Treatise on
Independence, criterion of, for attri- Probability, 397.
butes, 25-28; case of complete, Kick of a horse, deaths from, followfor
 attributes, 56-57; form of ing law of small chances, 265-266 ;
contingency or correlation table 369-370.
in case of, 71 ; goodness of fit test King George, refs., graduation of,
for, 378-387. age statistics, 105.
Index-numbers of prices, def., 126; Knibbs, G. H., refs., price indexuse
 of geometric mean for, 126- numbers, 390; frequency-curves,
127 ; use of harmonic mean, 129 ; 394.
refs., 130-131, 390-391. Koren, J., refs., History of Statistics,
Indices, correlation between, 215- 390.
216 ; refs., 226, 252, 392.
Infirmities, census tabulation of, LABOURERS, earnings of agricultural.
14-15; association between deaf- See Earnings.
mutism and imbecility, 32-33, 38. Laplace, Pierre Simon, Marquis de,
Inoculation, cholera, examples, 31- probable error of median, 344.
32, 34-35, 381-384. Refs., normal curve, 314; mean
Intermediate observations, in a deviation least about the median,
frequency-distribution, classifica- 154 ; Théorie analytique des probation
 of, 80-81, 362-363 ; in corre- bilités, 154, 354, 361 ; Essai philoation
 table, 164. sophique, 361, 397.
Isotropy, def., 68 ; generally, 67-71; Larmor, Sir J., use of word * statisof
 normal correlation table, 328- tical,” 4.
331 ; refs., 73. Lee, Alice, data cited from, 96, 122,
Isserlis, L., refs., partial correlation- 160, 161. Refs., inheritance of
ratio, 252, 392; conditions for fertility and fecundity, 208, 226 ;
real significance of probable errors, tables of functions, 358, 359.
354 ; probable error of mean, 395. Lemna minor, correlation between