How do you calculate total count IOA?

Total Count Interobserver Agreement (IOA) is a method used to assess the reliability of different observers measuring the same behavior. To calculate Total Count IOA, you take the smaller count from two observers and divide it by the larger count. This ratio is then multiplied by 100 to express it as a percentage. This percentage reflects how closely the two observers' counts agree with one another relative to the total counts observed.

By dividing the smaller count by the larger count, you ensure that the IOA represents a proportion of agreement, which is crucial for understanding the reliability of data in behavioral assessments. Reporting this as a percentage helps in conveying the level of agreement clearly and succinctly.

The other options do not accurately capture this method. Adding counts would not give a measure of agreement but rather a total, while simply dividing the larger by the smaller would misrepresent the intended outcome, leading to a misleading value. Multiplying counts by 10 does not pertain to the calculation of IOA and would not provide any meaningful insight regarding observer agreement.