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Test an hypothesis on one sample, then test it on another;
Obtain very small tables which have the properties of the original table.
自动化和可定制化
大多数统计函数可以在VBA例程中进行修改和自动化，从而节省宝贵的时间。
Random stratified (1): Rows are chosen at random within N sequences of observations of equal length, where N is determined by dividing the number of observations by the requested sample size;
Systematic from random start: From the j'th observation in the initial table, an observation is extracted every k observations to be used in the sample. j is chosen at random from among a number of possibilities depending on the size of the initial table and the size of the final sample. k is determined such that the observations extracted are as spaced out as possible
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