Alexandria Digital Research Library

The Intersection of Sample Size, Number of Indicators, and Class Enumeration in LCA : A Monte Carlo Study

Author:
Morovati, Diane
Degree Grantor:
University of California, Santa Barbara. Education
Degree Supervisor:
Karen Nylund-Gibson
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2014
Issued Date:
2014
Topics:
Statistics
Keywords:
Monte Carlo
LCA
Simulation
Class Enumeration
Latent Class Analysis
Genres:
Dissertations, Academic and Online resources
Dissertation:
Ph.D.--University of California, Santa Barbara, 2014
Description:

This Monte Carlo simulation study examined the performance of the most commonly used fit indices in selecting the "correct" latent class model while varying factors such as: the true number of latent classes, the size of the latent classes (i.e., class prevalence), the nature of the latent classes, the number of indicators, and sample size. Specifically, the fit indices examined in this simulation study were the Akaike Information Criterion (AIC), the Consistent Akaike Information Criterion (CAIC), the Bayesian Information Criterion (BIC), the adjusted Bayesian Information Criterion (ABIC), the adjusted Lo-Mendell-Rubin likelihood ratio test (LMR-LRT), the parametric bootstrapped likelihood ratio test (BLRT), the approximate Bayes Factor (BF), and the correct model probability (cmP). No study to date has examined the performance of the BF and cmP in recovering the correct latent class model.

This simulation study also aimed to simultaneously examine and understand how sample size, the number of observed indicators, and class enumeration intersect in latent class analysis (LCA) models. In other words, when sampling observations from a larger population, is there a critical point where the size of the sample and the number of indicators cannot uncover all existing heterogeneity? That is, at what point is specificity of the emerging latent classes lost?

All data were generated and analyzed using Mplus latent variable software (Muthen & Muthen, 1998-2013). The specific data generation and analysis conditions in this dissertation were created based on a literature search of Education and Psychology related databases. Results from this study will help applied researchers using LCA models further understand which fit index to trust under various conditions when going through the class enumeration process in practice. Specifically, the ABIC and BLRT indices emerged as being the highest performing across a variety of conditions considered in this study. Results also highlight the practical importance of thoughtfully considering sample size and the number of indicators included when estimating and interpreting LCA models. Findings of this dissertation provide evidence for a relatively strong interplay between sample size, number of indicators, and class enumeration in LCA models.

Physical Description:
1 online resource (125 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3fj2dx5
ISBN:
9781321202557
Catalog System Number:
990045116190203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Diane Morovati
File Description
Access: Public access
Morovati_ucsb_0035D_12179.pdf pdf (Portable Document Format)