# 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