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stata面板数据的做法介绍，英文的，把面板数据的命令介绍的比较详细文字

Regression with Panel Data (SW Ch. 8) A panel dataset contains observations on multiple entities (individuals), where each entity is observed at two or more points in time. Examples: • Data on 420 California school districts in 1999 and again in 2000, for 840 observations total. • Data on 50 U.S. states, each state is observed in 3 years, for a total of 150 observations. • Data on 1000 individuals, in four different months, for 4000 observations total...............................