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Table 2 Calculation of the interobserver agreement (kappa coefficient)

From: Is overexpression of HER-2 a predictor of prognosis in colorectal cancer?

    Pathologist 2 Total
    1+ 2+ 3+ 1.00
Pathologist 1 1+ Count (n) 7 1 0 8
   Pathologist 1 (%) 87.5 12.5 0 100
   Pathologist 2 (%) 100 11.1 0 44.4
   % of Total 38.9 5.6 0 44.4
  2+ Count (n) 0 8 0 8
   Pathologist 1 (%) 0 100 0 100
   Pathologist 2 (%) 0 88 0 44.4
   % of Total 0 44 0 44.4
  3+ Count (n) 0 0 2 2
   Pathologist 1 (%) 0 0 100 100
   Pathologist 2 (%) 0 0 100 11.1
   % of Total 0 0 11.1 11.1
  Total Count (n) 7 9 2 18
   Pathologist 1 (%) 38.9 50 11.1 100
   Pathologist 2 (%) 100 100 100 100
   % of Total 38.9 50 11.1 100
Symmetric measures  
  Value Standard error (a) Approximate T (b) Approximate significance   
Kappa coefficient 0.906 0.092 4.894 0.00   
Number of valid cases (n) 18      
  1. a Not assuming the null hypothesis.
  2. b Using the asymptotic standard error assuming the null hypothesis.