We employed a non parametric and a parametric model to estimate the results. Calculated results suggested that the mean WTP estimated by closed ended question format is 3～4 times of the mean WTP estimated by open ended question format.
分析结果表明,采用不同类型的调查方法得到的结论有较大差异,其中:开放式问卷的调查结果与投标卡式问卷的分析结果相差不大;封闭式问卷格式的调查结果是开放式问卷调查结果的3～4倍;同时,双边界两分式问卷比单边界两分式问卷更能逼近参与者的真实支付意愿。
参考来源 - 额济纳旗生态系统服务恢复价值评估方法的比较与应用·2,447,543篇论文数据，部分数据来源于NoteExpress
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