414 THEORY OF STATISTICS.
melide), 364. See also Correla- tions, 226, 252; errors of sam-
tion, illustrations and examples. pling (small samples), 289 ; inocu-
Frequency-polygon, construction of, lation statistics and association,
84. 40; application of law of small
Frequency-surface, forms and ex- chances, 393; multiple happen-
amples of, 164-167 ; diagrams, 166, ings, 394.
facing 166 ; normal, diagram, 166. Grindley, H. S., refs., errors of feed-
See Correlation, normal. ing trials, 396.
Grouping of observations to form
GABAGLIO, A., ref., Teoria generale frequency-distribution, choice of
della statistica, 6. class-interval, 79-80; influence
Galloway, T., ref., Treatise on Prob- on mean, 113-114, 115, 116 ; in-
ability, 361. fluence on standard-deviation,
Galton, Sir Francis, Hereditary 140, 212.
Genius, 3 ; frequency-distribution
of consumptivity, 104; grades HAIR-coLOUR: and eye-colour, ex-
and percentiles, 150, 152 ; regres- ample of contingency, 61-63, 66-
sion, 176 ; Galton’s function (cor- 67 ; non-isotropy, 68, 69 ; theory
relation - coefficient), 204; bi- of sampling applied to certain
nomial machine, 299; normal data, 270-271, 272.
correlation, 328 ; data cited from, Hall, A. D., refs., errors of agri-
34, 46, 70. Refs., geometric mean, cultural experiment, 396.
130; percentiles, 154; correla- Harmonic mean. See Mean, har-
tion, 188, 332; correlation be- monic.
tween indices, 226; binomial Harris, J. A., refs., short method of
machine, 313; Natural Inherit- calculating coefficient of correla-
ance, 154, 313, 332. tion, 209 ; intra-class coefficients,
Gauss, C. F., use of term ‘ mean 209; correlation, miscellaneous,
error,” 144. Refs., normal curve, 392; error in field experiments,
314 ; method of least squares, 361. 396.
Geiger, H., refs., law of small chances, Hart, B., refs., effect of errors on
269. correlation, 391.
Geometric mean. See Mean, geo- Head-breadths of Cambridge stu-
metric. dents, table, 84 ; diagram, 85.
Geometric (logarithmic) mode, 128. Helguero, F. de, refs., dissecting
Gibbs, J. Willard, Principles of compound normal curve, 315.
Statistical Mechanics, 4. Henry, A., refs., Calculus and Prob-
Gibson, Winifred, refs., Tables for ability, 397.
computing probable errors, 354, Heron, D., refs., association, 40 ; re-
358. lation between fertility and social
Gini, C., refs., index-numbers, 391. status, 208; defective physique
Grades, 152, 153. and intelligence, application of
Graphic method, of representing correction for age-distribution,
frequency-distributions, 83-87 ; of etc., 226; abac giving probable
interpolation for median of per- errors of correlation - coefficient,
centiles, 118, 151-152; of repre- 354, 358; probable error of a
senting correlation between two partial correlation-coefficient, 354.
variables, 180-181 ; of estimating Histogram, construction of, 84.
correlation - coefficient, 203-204 ; History, refs., of statistics generally,
of forming one binomial polygon 5-6, 390 ; of correlation, 188, 391 ;
from another, 295-297. of normal curve, 393.
Graunt, John, ref., Observations on Hollis, T., cited re Cosin’s Names of
the Bills of Mortality, 6. the Roman Catholics, etc., 100.
Gray, John, data cited from, 270. Hooker, R. H., correlation between
Greenwood, M., refs., index correla- weather and crops, 196 ; between
