Abstract
This research provides a framework for specifying the latent trait distribution using the family of loglinear smoothing models. Connections between loglinear smoothing models and the standard normal, normal, and direct estimation of the distribution are the beginning of this framework. The framework is important because it gives the connection between the standard approaches and loglinear smoothing models so that parsimonious (smoothing) models providing adequate representation of the distribution can be identified. Future extensions will include additional complex models for estimating the latent trait distribution.
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Notes
- 1.
Note that in the present paper, we label estimation methods based on the model for the latent distribution only; while it is acknowledged that the parametric form of the item response function may change, it will be restricted to having a parametric form throughout this discussion.
- 2.
LLSEM: LogLinear Smoothing Expectation Maximization (Casabianca and Lewis 2011) is a software available upon request by Jodi M. Casabianca (jodicasa@andrew.cmu.edu).
- 3.
The maximum absolute difference between the estimated item characteristic curves (ICCs) and the true ICCs was used to assess overall recovery of item parameters. That is, the absolute difference between the ICC using estimated item parameters and the ICC using the true item parameters was computed for each item across the Q quadrature points. Within condition, item, and replication, the maximum of these absolute differences (over the Q quadrature points) was determined. The mean of the absolute maximum difference was taken across the 50 items, and the mean was also taken across replications.
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Casabianca, J.M., Junker, B.W. (2013). Estimating the Latent Trait Distribution with Loglinear Smoothing Models. In: Millsap, R.E., van der Ark, L.A., Bolt, D.M., Woods, C.M. (eds) New Developments in Quantitative Psychology. Springer Proceedings in Mathematics & Statistics, vol 66. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9348-8_27
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