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Table 4 Terms involved in latent class models, for R = 3 laboratories

From: Use of latent class models to accommodate inter-laboratory variation in assessing genetic polymorphisms associated with disease risk

Model Terms of interest Other terms fitted
1 Test accuracy (A|X, B|X, C|X) True exposure prevalence (X)
2 Test accuracy, differential by disease (A|DX, B|DX, C|DX) True exposure prevalence (X)
3 Test accuracy, constant across labs (A|X = B|X = C|X) True exposure prevalence (X)
4 Test accuracy, constant across labs, differential by disease (A|DX = B|DX = C|DX) True exposure prevalence (X)
5 True exposure by disease (X|D) Test accuracy (A|X, B|X, C|X)
6 True exposure by disease (X|D) Test accuracy, constant across labs (A|X = B|X = C|X)
7 Empirical exposure by disease (A|D, B|D, C|D)  
8 Empirical exposure by disease constant across labs (A|D = B|D = C|D)  
  1. = : indicates terms constrained to be equal