Longitudinal data

Analyzing Incomplete Item Scores in Longitudinal Data by Including Item Score Information as Auxiliary Variables

Copyright © Taylor & Francis Group, LLC. The aim of this study is to investigate a novel method for dealing with incomplete scale scores in longitudinal data that result from missing item responses. This method includes item information as auxiliary …

Including auxiliary item information in longitudinal data analyses improved handling missing questionnaire outcome data

© 2015 Elsevier Inc. All rights reserved. Objectives Previous studies show that missing values in multi-item questionnaires can best be handled at item score level. The aim of this study was to demonstrate two novel methods for dealing with …