stata中关于权数的使用问题

Question

各位专家好，我在使用stata分析CFPS数据内容时，需要处理权数，先设置抽样设计，可是我参考代码进行写，结果一直都是无效变量，我刚开始以为是原始数据中有psu这个变量，所以将原始数据中的psu变量名改了，但是还是不行。以下是代码展示。

.
. svyset [pweight=rswtps_natcs20n], strata(subpopulation), psu(psu1_encoded)
invalid 'psu'
r(198);

. svyset [pweight=rswtps_natcs20n], strata(subpopulation), psu(psu1)
invalid 'psu'
r(198);

.
. . svyset[pweight=rswtps_natcs20n],strata(subpopulation),psu(psu1)
invalid 'psu'
r(198);

. svyset [pweight=rswtps_natcs20n], strata(subpopulation), psu(psu1)
invalid 'psu'
r(198);