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Web-based research: Methodological variables' effects on dropout and sample characteristics

机译：基于网络的研究：方法论变量对辍学和样本特征的影响

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Previous research has made a beginning in addressing the importance of methodological differences in Web-based research. The present paper presents four studies investigating whether sample type, financial incentives, time when personal information is requested, table design, and method of obtaining informed consent influence dropout and sample characteristics (both demographics and measured, attitudes). Undergraduates were less likely to drop out than nonstudents, and nonstudents offered a financial incentive were less likely to drop out than those offered no incentive. Complex tables, tables that were too wide, requests for personal information on the first page, and the imposing of additional informed consent procedures each provoked early dropout. As was expected, nonstudents and those presented with complex tables showed more measurement error and attitude differences. Asking for personal information and imposing additional consent procedures affected the demographic makeup, raising challenges to external validity.
机译：先前的研究已经开始着手解决基于Web的研究中方法学差异的重要性。本文提出了四项研究，调查样本类型，经济诱因，要求提供个人信息的时间，表格设计以及获得知情同意的方法会影响辍学和样本特征（人口统计和测度，态度）。与非学生相比，本科生辍学的可能性较小，与未提供经济激励的学生相比，提供经济奖励的非学生的辍学可能性较小。复杂的表格，太大的表格，首页上的个人信息请求以及施加额外的知情同意程序均会导致提早退学。不出所料，非学生以及带有复杂表格的学生表现出更多的测量误差和态度差异。询问个人信息并实施其他同意程序影响了人口组成，从而对外部有效性提出了挑战。

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