Latent item predictors with fixed effects

  • Dirk J. M. Smits
  • Stephen Moore
Part of the Statistics for Social Science and Public Policy book series (SSBS)


The Rasch model (Rasch, 1960) and the linear logistic test model (LLTM, Fischer, 1973, 1977) are two commonly used item response models. Both models are discussed in Chapter 2. The Rasch model assumes item indicators as predictors, so that each item has a specific effect, the weight of the corresponding item indicator. The LLTM explains these effects in terms of item properties, or in other words item properties are used as item predictors. Therefore, the LLTM may be considered an item explanatory model, in contrast with the Rasch model which is descriptive.


Item Type Aggressive Reaction Item Parameter Random Weight Norm Violation 
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© Springer Science+Business Media New York 2004

Authors and Affiliations

  • Dirk J. M. Smits
  • Stephen Moore

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