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Results

#1. A team of RBTs is collecting data on a client’s tantrum behavior across three 10-minute intervals. Observer 1 records the following counts Interval 1 4 tantrums, Interval 2 2 tantrums, Interval 3 5 tantrums. Observer 2 records Interval 1 3 tantrums, Interval 2 1 tantrum, Interval 3 5 tantrums. To assess the reliability of their data, the BCBA instructs them to calculate the mean count per interval Interobserver Agreement (IOA). What is the calculated IOA for this session?

75

70

83.33

66.67

To calculate the Mean Count Per Interval IOA you first determine the IOA for each individual interval using the formula smaller count larger count 100 Then you sum the IOA percentages for all intervals and divide by the number of intervals to find the mean average 1 Interval 1 IOA Smaller count 3 Larger count 4 100 75 2 Interval 2 IOA Smaller count 1 Larger count 2 100 50 3 Interval 3 IOA Smaller count 5 Larger count 5 100 100 Next sum the individual interval IOAs 75 50 100 225 Finally divide the sum by the number of intervals 3 225 3 75 Therefore the mean count per interval IOA for this session is 75 This method provides a more nuanced view of agreement than total count IOA by accounting for variability across observation periods

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