我通过“gen 收益率=(收盘价/l.收盘价)-1”计算出日收益率，想用“ascol 收益率,toweek returns(simple) gen(周收益率)”计算周收益率，但是一直报错，求大神教教我应该如何解决！感谢！

ascol 收益率, toweek returns(simple)
asrol may not be combined with by
r(190);


. ascol 收益率,toweek returns(simple) prices keep(vars) gen(周收益率)
You have specified both prices and returns option
Only one option is allowed at a time


. ascol 收益率,toweek returns(simple) gen(周收益率)
variable week_id_000 already defined
r(110);