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| ** 根据X1分类，生成每组样本数
by X1: gen X2=_N //包含缺失值
by X1: gen X2=_N if X1!=. //排除缺失值
** count函数: 表达式exp计算结果不是缺失值的样本数
egen newvar = count(exp), by(varlist)
** total 函数: 表达式exp计算结果的样本数
gen count=1
egen count_num = total(exp), by(varlist)
** seq 函数: 循环计数，生成数列 (每个数字计数两次，范围3～4，重复计数: 3,3,4,4, | 3,3,4,4, | 3,……)
egen list=seq(), from(3) to(4) block(2) by(varlist)
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