Stability of three‐wave simplex estimates of reliability |
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| Authors: | Germà Coenders Willem E Saris Joan M Batista‐Foguet Anna Andreenkova |
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| Institution: | 1. School of Management and Business Administration , University Ramon Llull , Barcelona, Spain;2. Department of Economics , University of Girona , Campus Montilivi, Girona, 17071, Spain E-mail: coenders@econ.udg.es;3. Department of Methods and Techniques , University of Amsterdam , The Netherlands;4. School of Management and Business Administration , University Ramon Llull , Barcelona, Spain;5. Institute for Comparative Social Research , Moscow, Russia |
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| Abstract: | 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. |
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