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Table 3 Number of parameters in latent class model, by number of laboratories (R)

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

Model number

Association of interest

Accuracy differential by laboratory

General number of labs (R)

R = 1

R = 2

R = 3

1

Observed vs. true exposure status: EX

Yes

2R + 2

4

6

8

2

 

Yes*

4R + 2

6

10

14

3

 

No

4

4

4

4

4

 

No*

6

6

6

6

5

Disease vs. true exposure status: DX

Yes

2R + 3

5

7

9

6

 

No

5

5

5

5

7

Disease with observed exposure status: DE

Yes

2R + 1

3

5

7

8

 

No

3

3

3

3

  1. * error rates are (additionally) differential by disease status
  2. D- disease; X-true genotype status; E-genotype status measured by laboratory test.