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用SPSS或EVIEWS分析数据，一共有30个指标，需要多少年的统计数据？急

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关键词：统计数据 多少年 EVIEWS Views Eview 软件应用 统计

“How many subjects do I need?” Neither7 nor 30 nor any number is an all-purpose answer. A sample size of 30 is a“large sample” in some textbook discussions of “normal approximation”; yet30,000 observations still may be too few to assess a rare, but seriousteratogenic effect. The best first response to “how many?” may be not a number,but a sequence of further questions. A study’s size and structure should dependon the research context, including the researcher’s objectives and proposedanalyses.

www.columbia.edu/~mvp19/RMC/M6/M6.doc‎