1. What is Percentage Agreement?

Percentage Agreement (PA) is a statistical measure that calculates the proportion of agreement between two raters or measurement systems. It represents the percentage of cases where both raters agree in their assessments.

2. How Does the Calculator Work?

The calculator uses the percentage agreement formula:

Where:

• \( A \) — Number of agreements between raters
• \( T \) — Total number of items assessed

Explanation: The formula calculates the simple proportion of agreement cases relative to the total number of cases, expressed as a percentage.

3. Importance of Percentage Agreement

Details: Percentage agreement is commonly used in research, quality control, and inter-rater reliability studies to measure consistency between observers or measurement tools.

4. Using the Calculator

Tips: Enter the number of agreements and total items assessed. Both values must be positive integers, and agreements cannot exceed total items.

5. Frequently Asked Questions (FAQ)

Q1: What is considered good percentage agreement?
A: Generally, agreement above 80% is considered good, but this varies by field and the consequences of disagreement.

Q2: How does percentage agreement differ from Cohen's kappa?
A: Percentage agreement doesn't account for chance agreement, while Cohen's kappa provides a chance-corrected measure of agreement.

Q3: When is percentage agreement most appropriate?
A: It's most useful for simple agreement measurements or when chance agreement is expected to be minimal.

Q4: What are the limitations of percentage agreement?
A: It doesn't distinguish between different types of disagreement and doesn't account for agreement that might occur by chance.

Q5: Can percentage agreement be used for more than two raters?
A: While typically used for two raters, variations exist for multiple raters, though other measures like Fleiss' kappa are often preferred.