When the response mechanism is believed to be not missing at random (NMAR), a valid analysis requires stronger assumptions on than standard statistical methods would otherwise require. Semiparametric estimators have been developed under parametric model mechanism. In this paper, new test proposed guarantee identifiability without using instrumental variable assumption. Furthermore, we develop o...

t he effect of non-response on health and lifestyle measures has received extensive study, showing at most relatively modest effects. Nonresponse bias with respect to personality has been less thoroughly investigated. The present study uses data from responding individuals as a proxy for the missing data of their nonresponding family members to examine the presence of nonresponse bias for perso...

OBJECTIVES For random-digit-dial telephone surveys, the increasing difficulty in contacting eligible households and obtaining their cooperation raises concerns about the potential for nonresponse bias. This report presents an analysis of nonresponse bias in the 2007 National Survey of Children's Health, a module of the State and Local Area Integrated Telephone Survey conducted by the Centers fo...

BACKGROUND Web-based survey research has several benefits, including low cost and burden, as well as high use of the Internet, particularly among young adults. In the context of longitudinal studies, attrition raises concerns regarding the validity of data, given the potential associations with individual and institutional characteristics, or the focal area of study (eg, cigarette use). OBJEC...

Among the threats to validity of conclusions from a health survey is the bias who can result from differences between people who respond to the survey and people that do not respond. When respondents and nonrespondents have very different characteristics and the proportion of nonrespondents is at least moderately large, unadjusted survey estimates are often severely biased. Thus, it is importan...

While the individual components of total survey error have been well documented in the literature, relatively little is known about the intersection of these error sources. In particular, there is scant empirical work on the interplay between nonresponse error and measurement error – despite the potentially significant implications for data quality as well as techniques used to recruit responde...

Understanding the behaviors and attitudes of at-risk populations is fundamental to controlling the spread of HIV, the virus that causes AIDS. The problem of nonresponse among these populations, however, plagues survey research designed to address these issues. Previous work undertaken to map out the dynamics of nonresponse--both noncontacts and refusals--have primarily focused on exploring the ...