Bartolucci, Francesco and Giorgio E., Montanari and Pandolfi, Silvia (2012): Item selection by an extended Latent Class model: An application to nursing homes evaluation.

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Abstract
The evaluation of nursing homes and the assessment of the quality of the health care provided to their patients are usually based on the administration of questionnaires made of a large number of polytomous items. In applications involving data collected by questionnaires of this type, the Latent Class (LC) model represents a useful tool for classifying subjects in homogenous groups. In this paper, we propose an algorithm for item selection, which is based on the LC model. The proposed algorithm is aimed at finding the smallest subset of items which provides an amount of information close to that of the initial set. The method sequentially eliminates the items that do not significantly change the classification of the subjects in the sample with respect to the classification based on the full set of items. The LC model, and then the item selection algorithm, may be also used with missing responses that are dealt with assuming a form of latent ignorability. The potentialities of the proposed approach are illustrated through an application to a nursing home dataset collected within the ULISSE project, which concerns the qualityoflife of elderly patients hosted in Italian nursing homes. The dataset presents several issues, such as missing responses and a very large number of items included in the questionnaire.
Item Type:  MPRA Paper 

Original Title:  Item selection by an extended Latent Class model: An application to nursing homes evaluation 
Language:  English 
Keywords:  ExpectationMaximization algorithm, Polytomous items, Qualityoflife, ULISSE project 
Subjects:  C  Mathematical and Quantitative Methods > C1  Econometric and Statistical Methods and Methodology: General > C13  Estimation: General I  Health, Education, and Welfare > I1  Health > I11  Analysis of Health Care Markets C  Mathematical and Quantitative Methods > C3  Multiple or Simultaneous Equation Models; Multiple Variables > C33  Models with Panel Data; Longitudinal Data; Spatial Time Series 
Item ID:  38757 
Depositing User:  Francesco Bartolucci 
Date Deposited:  13. May 2012 17:13 
Last Modified:  17. Feb 2013 20:11 
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URI:  http://mpra.ub.unimuenchen.de/id/eprint/38757 