recall bias


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recall bias

systematic error due to differences in accuracy or completeness of recall to memory of past events or experiences.

recall bias

Memory bias Psychology A type of information bias that occurs when there are differences in how exposure groups or disease groups remember certain information. See Bias. Cf Interviewer bias.

re·call bi·as

(rē'kawl bī'ăs)
Systematic error due to differences in accuracy or completeness of the memory of past events or experiences.

recall bias

Distortion introduced into a research investigation that relies on the memory of subjects, specifically, their recollections of elements that might have contributed to the eventual development of a disease or condition. A research subject's memories after the occurrence of an adverse event, e.g., the diagnosis of a serious ailment, may be unduly influenced by his or her assumptions, beliefs, expectations, or prior education about possible causes of that ailment and thus may not reflect the true breadth of exposure contributing to the occurrence of the disease.
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However, there remained the potential for volunteer bias and recall bias.
Self-report of vaccination may be subject to recall bias, as young adults likely are not able to remember accurately the number of vaccines they've received as children or as adults, the researchers noted.
Limitations include the cross-sectional design that rules out any conclusions about direct cause, and the use of questionnaire data, which inherently comes with problems of report and recall bias.
Thus it would only appear (falsely) that abortion was associated with breast cancer, due to recall bias.
Prior research relied on sleep diaries kept by study participants, which are subject to recall bias, according to the researchers.
Since they were asked about abortion at the start of the study, recall bias was unlikely to play a role in the findings.
As with other studies using dietary recall through FFQ, there is a potential for recall bias and misclassification.
To help rule out the possible contribution of recall bias, researchers also conducted a sensitivity analysis comparing mothers of malformed infants with mothers of infants with other malformations not implicated in the Broussard NBDPS study.
Experiences of other administrative officers and specialists involved in trauma team were also shared to remove the recall bias.
The authors comment that the self-reported data may be inaccurate because of such issues as social desirability and recall bias, and that their use of PSA as an objective biological marker of semen exposure "circumvents the problems of relying only on self-report.
A limitation of the study is the risk of recall bias because participants were asked to remember their sun, eating and supplement habits from years before," Laursen said.
The "evidence" she quotes from the Canadian study may be correct but this article, published in 2009, also states that "there are, however, several limitations to this study warranting cautious interpretation of the results", including small sample size, proxy reporting and potential recall bias, as subjects were questioned after the event.