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Table 6 Error variance affected by Harvester (left) and error variance affected by ELISA operator (right) in the second trial.

From: Quality assessment of an interferon-gamma release assay for tuberculosis infection in a resource-limited setting

εi. Harvester P value ε.j ELISA operator P value
Nil NE* (A > B)   Nil A:0.000014
B:0.000035
0.4832
TB-Antigen A:0.0001
B:0.00002
0.2391 TB-Antigen NE (A > B)  
Mitogen A:2.1184
B: 0.1788
0.3291 Mitogen A:1.9065
B: 0.2747
0.33347
  1. *NE = not estimable by this calculation.