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Table 1 Parameters of a simulation to compare the true and estimated negative binomial Intraclass Correlation Coefficient (ICC) using an example of culture results for a specific bacterium in pen floor samples (variance 0.5) collected over several days apart and simultaneously by different veterinarians and across different dairies

From: Reliability of environmental sampling culture results using the negative binomial intraclass correlation coefficient

Scenario r β Variance E(Y) True ICC
    Dairy Pen Day Veterinarian   
1 1 0 0.5 0.5 0.2 0.1 1.92 0.3382
2 1 0 1 0.5 0.2 0.1 2.46 0.3888
3 1 2 0.5 0.5 0.2 0.1 14.15 0.362
4 1 2 1 0.5 0.2 0.1 18.17 0.4011
5 2 0 0.5 0.5 0.2 0.1 1.92 0.4616
6 2 0 1 0.5 0.2 0.1 2.46 0.5275
7 2 2 0.5 0.5 0.2 0.1 14.15 0.5072
8 2 2 1 0.5 0.2 0.1 18.17 0.5503
9 1 0 0.5 0.5 0.2 0.5 2.34 0.2236
10 1 0 1 0.5 0.2 0.5 3 0.2574
11 1 2 0.5 0.5 0.2 0.5 17.29 0.2319
12 1 2 1 0.5 0.2 0.5 22.2 0.2617
13 2 0 0.5 0.5 0.2 0.5 2.34 0.3037
14 2 0 1 0.5 0.2 0.5 3 0.3476
15 2 2 0.5 0.5 0.2 0.5 17.29 0.3192
16 2 2 1 0.5 0.2 0.5 22.2 0.3556