Executive Summary In September 2008, the AAPOR Executive Council established an Opt-
In Online Panel Task Force and charged it with “reviewing the current empirical findings …

Reality can be distorted in many ways when seen through a questionnaire or an interview.
Such distortions may be systematic, introducing bias. Bias can spoil research by indicating …

BACKGROUND: There is growing interest in clinical screening for pediatric social
determinants of health, but little evidence on formats that maximize disclosure rates on a …

In this paper, we formulate a model of early childhood development in which mothers have
subjective expectations about the technology of skill formation. The model is useful for …

Background: Self-report measures of medication adherence are inexpensive and minimally
intrusive. However, the validity of self-reported adherence is compromised by recall errors …

Background Exclusive breastfeeding is recommended as the best feeding alternative for
infants up to six months and has a protective effect against mortality and morbidity. It also …

Studies on family planning methods traditionally have relied on self-reports of unknown
validity and reproducibility. Social desirability bias, a type of information bias, occurs when …

Background Audio computer-assisted self-interview (ACASI) may elicit more frequent
reporting of socially sensitive behaviours than face-to-face (FtF)-interview. However, no …

ObjectiveTo determine the impact of facility-based semi-intensive and home-based intensive
counselling in improving exclusive breast-feeding (EBF) in a low-resource urban setting in …

OBJECTIVES. Parents and children often overreport adherence to treatment regimens,
which in turn complicates interpretation and application of clinical trial findings. The …