BACKGROUND Participant nonresponse in an HIV serosurvey can affect estimates of HIV prevalence. Nonresponse can arise from a participant's refusal to provide a blood sample or the failure to trace a sampled individual. In a serosurvey conducted by the African Population and Health Research Center and Kenya Medical Research Centre in the slums of Nairobi, 43% of sampled individuals did not provi...

PURPOSE Phase II trials in locally advanced rectal cancer have shown that cetuximab-based neoadjuvant radiochemotherapy is feasible but without an improvement in complete pathologic response rates. Our goal was to identify patients who would benefit from cetuximab-based neoadjuvant chemoradiation measuring gene expression levels of proteins involved in tumor growth [endothelial growth factor re...

Attrition in longitudinal studies is a major threat to the representativeness of data and generalizability findings. Typical approaches address systematic nonresponse are either expensive unsatisfactory (e.g., oversampling) or rely on unrealistic assumption missing at random multiple imputation). Thus, models that effectively predict who most likely drops out subsequent occasions might offer op...

Abstract Evidence from the household survey literature shows a declining response rate trend in recent decades, but whether similar exists for voluntary establishment surveys is an understudied issue. This article examines trends nonresponse rates and bias over period of 17 years annual cross-sectional refreshment samples IAB Establishment Panel Germany. In addition, rich administrative data ab...

The prevalence of faulty citations impedes the growth of scientific knowledge. Faulty citations include omissions of relevant papers, incorrect references, and quotation errors that misreport findings. We discuss key studies in these areas. We then examine citations to “Estimating nonresponse bias in mail surveys,” one of the most frequently cited papers from the Journal of Marketing Research, ...

BACKGROUND The current study considers potential nonresponse bias and data quality issues in the Multiethnic Cohort, a prospective study of lifestyle-cancer associations among adults ages 45 to 75 years from five ethnic groups in Hawaii and California. METHODS We examined determinants of early versus later response to the baseline questionnaire using logistic regression with response wave reg...

1. Introduction Unit nonresponse occurs when entire interviews are missing due to noncontact of a sampled individual or refusal to answer the questionnaire. Weighting is a standard method of unit nonresponse adjustment and is a natural extension of weighting for unequal probabilities of selection. However, unlike the sample weight, the nonresponse rate is usually unknown and must be estimated. ...

Background: Protein intake and physical activity have a substantial impact on body composition weight loss outcomes after bariatric surgery. The 24-h dietary recall 6-min walk test (6mWT) are frequently used to monitor protein activity, respectively. Despite its frequent use, it is unknown whether these tests can predict long-term loss. Methods: This retrospective study included 85 patients who...

At present we typically assess quality by relying heavily on summary process measures or macro paradata that is a by-product of sample selection and survey administration (e.g., item and unit nonresponse rates, response variances, sampling and coverage errors). These measures are an outgrowth of the randomization-based approach to survey sampling that triumphed in government agencies around the...

BACKGROUND Nonresponse bias in a longitudinal study could affect the magnitude and direction of measures of association. We identified sociodemographic, behavioral, military, and health-related predictors of response to the first follow-up questionnaire in a large military cohort and assessed the extent to which nonresponse biased measures of association. METHODS Data are from the baseline an...