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Table 6 Comparison between Cohen’s Kappa and Gwet’s AC1 according to prevalence rate

From: A comparison of Cohen’s Kappa and Gwet’s AC1 when calculating inter-rater reliability coefficients: a study conducted with personality disorder samples

PDs

Prevalence rate (%)

Cohen’s Kappa

Gwet’s AC1

% Agreement

Avoidant

26.32

1.000

1.000

100

 

18.75

1.000

1.000

100

 

10.00

1.000

1.000

100

 

0.0

0.0

.858

88

Dependent

12.50

1.000

1.000

100

 

6.25

1.000

1.000

100

 

5.26

.640

.934

95

 

0.0

0.0

.890

90

Obsessive-Compulsive

31.58

.883

.904

95

 

25.00

.714

.781

88

 

25.00

1.000

1.000

100

 

20.00

1.000

1.000

100

Passive-Aggressive

21.05

1.000

1.000

100

 

12.50

.600

.820

88

 

6.25

.636

.924

94

 

0.0

0.0

.890

90

Depressive

12.50

1.000

1.000

100

 

12.50

.765

.915

94

 

10.53

.604

.857

89

 

0.0

1.000

1.000

100

Paranoid

31.58

1.000

1.000

100

 

6.25

1.000

1.000

100

 

0.0

1.000

1.000

100

 

0.0

0.0

.890

90

Schizotypal

10.00

1.000

1.000

100

 

5.26

1.000

1.000

100

 

0.0

1.000

1.000

100

 

0.0

1.000

1.000

100

Schizoid

20.00

.737

.840

90

 

15.79

.565

.752

84

 

12.50

.600

.820

88

 

6.25

1.000

1.000

100

Histrionic

6.25

1.000

1.000

100

 

5.26

.641

.938

94

 

0.0

1.000

1.000

100

 

0.0

1.000

1.000

100

Narcissistic

10.00

1.000

1.000

100

 

0.0

1.000

1.000

100

 

0.0

1.000

1.000

100

 

0.0

1.000

1.000

100

Borderline

21.05

1.000

1.000

100

 

12.50

1.000

1.000

100

 

12.50

1.000

1.000

100

 

10.00

.615

.866

90

Total Antisocial

12.50

1.000

1.000

100

 

6.25

1.000

1.000

100

 

5.26

.441

.870

89

 

0.0

1.000

1.000

100