Implementation of weighting system for mixed-mode social surveys

本研究的目的是提出一种方法，使一个权重变量，以调整协变量分布时，混合模式的调查，同时管理不同的人口子集。我们也将我们的方法应用于真实的调查数据，讨论其效用。具体而言，我们注意到通过邮件或面对面的访问管理的概率样本和非概率样本的网络调查的比较。我们用后者来近似前者。该方法的核心是在协变量调整的框架下估计倾向得分，研究结果表明，在用不同的模型逼近概率样本的调查结果时，选择好的协变量集是非常重要的。我们提出了一个四步程序的变量选择更好的协变量调整。此外，我们还强调，在网络调查本身获得高质量的结果是成功的另一个关键。我们讨论了网络调查管理中质量控制的各个方面。基于这些结果，我们将进一步研究如何将混合模式调查的结果适当地整合到总体参数的单一估计中。

The purpose of the present study was to propose a method for making a weight variable to adjust for the covariate distribution when mixed-mode surveys were administered simultaneously on different subsets of population. We also apply our method to real survey data to discuss its utility. Specifically we pay attention to comparison of survey by mail or face-to-face interview administered to probability samples and web survey administered on non-probability samples. We use the latter to approximate the former. The core of our method is estimating the propensity score, based on the framework of covariate adjustment.As the result of our study, we found that in approximating the results of surveys on probability sample by results of survey done on non-probability samples by different mode, choosing good sets of covariate is very important. We proposed a four-step procedure of variable selection for better covariate adjustment. In addition, we also emphasized that obtaining results of high quality in web survey itself is another key for success in that approximation. We discussed various aspects of quality control in web survey administration. Based on these results, we will further investigate into the task of appropriately integrate the results of mixed-mode surveys into single estimates of population parameter.