internalmdlinx Medical News about performance measurement • composite measure • item response theory • latent variable • false negative and positive rates.

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Normand S et al. - Neither the AMI raw sum score nor latent score discriminates hospital quality due to ceiling effects. Current methods for aggregating measures result in different hospital superior designations than those based on the latent score. Organizations that financially reward hospitals on the basis of such scores need to assess predictive validity of scores and determine a minimum level of classification accuracy.

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