Stability of three-wave simplex estimates of reliability

In this article 2 major problems of using the three-wave quasi simplex model to obtain reliability estimates are illustrated. The 1st problem is that the sampling variance of the reliability estimates can be very large, especially if the stability through time is low. The 2nd problem is that, for th...

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Bibliographic Details
Published in:Structural equation modeling 1999-01, Vol.6 (2), p.135-157
Main Authors: Coenders, Germà, Saris, Willem E., Batista-Foguet, Joan M., Andreenkova, Anna
Format: Article
Language:English
Subjects:
Estimation (Mathematics)
Markov Processes
Monte Carlo Methods
Reliability
Sampling
Simplex Models
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Summary:In this article 2 major problems of using the three-wave quasi simplex model to obtain reliability estimates are illustrated. The 1st problem is that the sampling variance of the reliability estimates can be very large, especially if the stability through time is low. The 2nd problem is that, for the reliability parameter to be identified, the model assumes a particular change process, namely a Markov process. We show that minor violations of this assumption can lead to a large bias in the reliability estimates. The problems are evaluated using both real and Monte Carlo data. A model with repeated measurements in 1 of the waves is also discussed.
ISSN:1070-5511
1532-8007
DOI:10.1080/10705519909540125