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通过对我国31个省市自治区第三产业产值进行不等概率抽样,从总体中抽取15个省市作为研究样本,来估算2009年全国第三产业总产值。最后将其估算的结果与简单随机抽样估算的结果相比较,得出结论:PPS抽样调查方法在个体差异比较大的情况下能够取得较好的估算效果。
By unequally sampling the output value of the tertiary industry of 31 provinces, autonomous regions and municipalities in China, 15 provinces and cities were selected as research samples to estimate the total output value of tertiary industry in China in 2009. Finally, the result of its estimation is compared with the result of simple random sampling, and the conclusion is drawn that the PPS sampling method can obtain good estimation results when the individual difference is relatively large.