fweights and aweights are allowed; see help weights.
Options
-------
bygroup(groupvar) requests inequality decompositions by population
subgroup, with subgroup membership summarized by groupvar.
w requests calculation of equally-distributed-equivalent incomes and
welfare indices in addition to the inequality index calculations.
summ requests presentation of summary, detail output for varname.
Saved results
-------------
S_9010, S_7525 Percentile ratios p90/p10, p75/p25
S_im1, S_i0, S_i1, S_i2 GE(a), for a = -1, 0, 1, 2 (defined below)
S_ahalf, S_i1, S_a2 A(e), for e = 0.5, 1, 2 (defined below)
S_gini Gini coefficient
求基尼系数可以用十八讲里的手动code：
*自定义程序
capture program drop gini //如果gini 命令已存在，则删除，否则跳过该步
program gini
gen m=pexp/hhsize //m 为人均纯收入
sort m //按人均纯收入由小到大排序
egen tp=sum(hhsize) //求总人口tp
egen texp=sum(pexp) //求总收入tinc
gen p=hhsize/tp //求每个家庭人口占总人口的比例p
gen w=pexp/texp //求家庭纯收入占总收入的比例w
gen q=sum(w) //求按人均纯收入排序后的累积收入比例
gen gini=1-sum(p *(2*q-w)) //计算出基尼系数（即gini 变量的最后一个数）
dis gini[_N] //显示基尼系数
end
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