Hidden Populations, Online Purposive Sampling, and External Validity: Taking off the Blindfold
Hidden Populations, Online Purposive Sampling, and External Validity: Taking off the Blindfold
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DOI：
10.1177/1525822x14526838
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发表时间：
2015-02-01
期刊：
影响因子：
1.7
通讯作者：
Lenton, Simon
中科院分区：
文献类型：
--
作者：
Barratt, Monica J.;Ferris, Jason A.;Lenton, Simon
在线目的性样本具有未知的偏差，可能不会严格用于对更广泛的人群进行推断，但这样的推断继续发生。我们比较了澳大利亚摇头丸使用者的人口统计学和药物使用特征的概率（国家药物战略家庭调查，n = 726）和有目的的样本（在线调查进行的一部分，混合方法研究在线药物讨论，n = 753）使用非参数（自举）和荟萃分析技术。我们发现人口统计学和药物使用流行率存在显着差异。理想情况下，隐藏人群的在线有目的样本应结合概率样本和民族志实地调查进行解释。
Online purposive samples have unknown biases and may not strictly be used to make inferences about wider populations, yet such inferences continue to occur. We compared the demographic and drug use characteristics of Australian ecstasy users from a probability (National Drug Strategy Household Survey, n = 726) and purposive sample (online survey conducted as part of a mixed-methods study of online drug discussion, n = 753) using nonparametric (bootstrap) and meta-analysis techniques. We found significant differences in demographics and drug use prevalence. Ideally, online purposive samples of hidden populations should be interpreted in conjunction with probability samples and ethnographic fieldwork.