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非线性响应函数的实验设计AI 解读

W. G. COCHRAN* This article reviews work on the planning of experiments with response functions nonlinear in some parameters. Apart from older work on dilution series experiments and quantal bioassays, this field is relatively recent, the mathematical and computing aspects being more complex than for linear responses. An efficient design requires good advance estimates of the parameters. Research has concentrated on (1) optimum estimation of the parameters, under an…

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抽样单位大小不等时的抽样理论AI 解读

JN SAMPLING, the sampling-units are usually chosen so as to be similar in size and structure. With some types of population, however, it is convenient or necessary to use sampling-units that differ in size. Thus the farm is often the sampling-unit for collecting agricultural data, though farms in the same county may vary in land acreage from a few acres to over 1,000 acres. Similarly, when obtaining information about sales or prices, the sampling-unit may be a dealer or…

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