6# davey001

索引你肯定见过的，只是没注意。

比如，你随便翻开手里一本英文教科书，书后都有索引，指出某个关键词在哪几页出现。

举例说明。这本书是Applied Multivariate Statistical Analysis (2003)
书后的索引如下：

有些页数出现的多，是因为这些页数的关键词比较多，信息量大。有些页码就不怎么出现，说明这些页里没有关键词，也就是说，写的基本上是废话……

Index
admissible, 329
agglomerative techniques, 308
allocation rules, 323
Andrews' curves, 39
angle between two vectors, 75
ANOVA, 103
ANOVA { simple analysis of variace, 103
Bayes discriminant rule, 328
Bernoulli distribution, 143
Bernoulli distributions, 143
best line, 221
binary structure, 303
Biplots, 356
bootstrap, 148
bootstrap sample, 150
Boston housing, 44, 112, 209, 259, 293,
316, 337
boxplot, 15
construction, 17
canonical correlation, 361
canonical correlation analysis, 361
canonical correlation coecient, 363
canonical correlation variable, 363
canonical correlation vector, 363
centering matrix, 93
central limit theorem (CLT), 143, 145
centroid, 312
characteristic functions, 125, 131
classic blue pullovers, 84
cluster algorithms, 308
cluster analysis, 301
Cochran theorem, 163
coecient of determination, 98, 109
corrected, 109
column space, 77, 221
common factors, 277
common principal components, 256
communality, 278
complete linkage, 311
computationally intensive techniques, 421
concentration ellipsoid, 138
conditional approximations, 160
conditional covariance, 433

作者引用索引的网页数量制表讨论这个问题很难发现，它吸引的兴趣。
呵呵，不知道准确不准确