Introduction: Item nonresponse and data quality

Comparison of Item and Unit Nonresponse in Household Surveys

1. Introduction Survey quality is thought to be impacted by nonresponse, both item nonresponse and survey or unit nonresponse. The relationship between item nonresponse and unit nonresponse has been studied by Dixon (2002). Dahlhamer et al. (2003) also studied item nonresponse across several federal surveys. The current study examines the nature of item nonresponse and the relationship with sub...

Tests of Certain Types of Ignorable Nonresponse in Surveys Subject to Item Nonresponse or Attrition

Analysts of cross-sectional or panel surveys often base inferences about relationships between variables on complete units, excluding units that are incomplete due to item nonresponse or attrition. This practice is justifiable if exclusion is ignorable in an appropriate sense. This paper characterizes certain types of ignorable exclusion in surveys subject to item nonresponse and develops tests...

Applying Multiple Imputation with Geostatistical Models to Account for Item Nonresponse in Environmental Data

A unified approach to linearization variance estimation from survey data after imputation for item nonresponse

Variance estimation after imputation is an important practical problem in survey sampling. When deterministic imputation or stochastic imputation is used, we show that the variance of the imputed estimator can be consistently estimated by a unifying linearize and reverse approach. We provide some applications of the approach to regression imputation, fractional categorical imputation, multiple ...

Introduction to circular data

In many diverse scientific fields, the measurements are directions. For instance, a biologist may be measuring the direction of flight of a bird or the orientation of an animal. A series of such observations is called ”directional data”. Since a direction has no magnitude, these can be conveniently represented as points on the circumference of a unit circle centered at the origin or as unit ...