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Table 3 Parameter estimates from a negative binomial generalized linear mixed model for culture results from a study on the reliability of an environmental sampling protocol and the Intraclass Correlation Coefficient (ICC) for similarity in samples collected by two veterinarians on the same day and from the same pen

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

   95% Confidence interval
Parameter Estimate Lower Upper
β 1.9516 1.3745 2.6011
r 1.379 1.0138 2.0225
σa 0.2691 2.07E-09 0.8657
σb 1.352 0.5786 2.028
σc 2.11E-09 2.06E-09 0.0303
σd 4.72E-04 2.06E-09 0.0359
ICC 0.5207 0.4033 0.6091
  1. arandom effect for dairy i, i = 1, 2, 3, 4.
  2. brandom effect for pen j, where for i = 1, j = 1,…,8, for i = 2, j = 1,…,11, for i = 3, j = 1,…,7 and for i = 4, j = 1,…,4.
  3. crandom effect for day k of sample collection, where k = 1,2,3.
  4. drandom effect for collector l, where l = 1, 2 and day k; k = 1, 2, 3.