Journal
SOCIOLOGICAL METHODS & RESEARCH
Volume 40, Issue 2, Pages 367-390Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0049124111400041
Keywords
attrition bias; longitudinal data; trajectory groups; finite mixture models
Categories
Ask authors/readers for more resources
This article reports on an extension of group-based trajectory modeling to address nonrandom participant attrition or truncation due to death that varies across trajectory groups. The effects of the model extension are explored in both simulated and real data. The analyses of simulated data establish that estimates of trajectory group size as measured by group membership probabilities can be badly biased by differential attrition rates across groups if the groups are initially not well separated. Differential attrition rates also imply that group sizes will change over time, which in turn has important implications for using the model parameter estimates to make population-level projections. Analyses of longitudinal data on disability levels in a sample of very elderly individuals support both of these conclusions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available