Participant carelessness and fraud: Consequences for clinical research and potential solutions.

Clinical psychological research studies often require individuals with specific characteristics. The Internet can be used to recruit broadly, enabling the recruitment of rare groups such as people with specific psychological disorders. However, Internet-based research relies on participant self-report to determine eligibility, and thus, data quality depends on participant honesty. For those rare groups, even low levels of participant dishonesty can lead to a substantial proportion of fraudulent survey responses, and all studies will include careless respondents who do not pay attention to questions, do not understand them, or provide intentionally wrong responses. Poor-quality responses should be thought of as categorically different from high-quality responses. Including these responses will lead to the overestimation of the prevalence of rare groups and incorrect estimates of scale reliability, means, and correlations between constructs. We demonstrate that for these reasons, including poor-quality responses-which are usually positively skewed-will lead to several data-quality problems including spurious associations between measures. We provide recommendations about how to ensure that fraudulent participants are detected and excluded from self-report research studies. (PsycINFO Database Record (c) 2019 APA, all rights reserved).