Methods and formulas for assessment agreement for Attribute Agreement Analysis

Select the method or formula of your choice.

Percent agreement

The percentage of matches in the ratings.

Formulas

The percent agreement = 100 * (m) / N

Notation

TermDescription
mthe number of matched ratings
Nthe total number of samples that are inspected

Confidence intervals for percent agreement

Minitab calculates the confidence intervals for the percent agreement.

Formulas

95% Lower Bound
Minitab calculates the lower bound of the percent agreement confidence interval when α = 0.05 by:
v1 = 2m
v2 = 2 (N – m + 1)
If percent = 0 (no agreement), the lower bound = 0. If percent = 1 (perfect agreement), use α instead of α/ 2 in the formula.
95% Upper Bound
Minitab calculates the upper bound of the percent agreement confidence interval when α = 0.05 by:
v1 = 2 (m + 1)
v2 = 2 (N – m)
If percent = 0 (no agreement), use a instead of α/ 2 in the formula. If percent = 1 (perfect agreement), the upper bound = 1.

Notation

TermDescription
Fv1, v2, 0.025the 2.5th percentile of the F distribution with v1 and v2 degrees of freedom
Fv1, v2, 0.975the 97.5th percentile of the F distribution with v1 and v2 degrees of freedom
mthe number of matches
Nthe number of inspected
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