本文针对居民生活用水实施阶梯水价下双误差项的需求函数模型——离散连续选择模型进行了讨论，并给出了R包下的仿真算法和程序。
The paper discusses the two-error model demand function in ladder-like water pricing of residents living water usage—discrete continuous model, and proposes its algorithm and program in R package.
其中城市自来水价和污水处理收费实行3级阶梯式累进加价，针对不同用户制定不同水费标准，并对低收入群体实行减免政策。
3-step cumulative mark-on was adopted for the tap water price and sewage water price, and the standards were different owing to different water users.
其中城市自来水价和污水处理收费实行3级阶梯式累进加价，针对不同用户制定不同水费标准，并对低收入群体实行减免政策。
3-step cumulative mark-on was adopted for the tap water price and sewage water price, and the standards were different owing to different water users.
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