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Results

#1. A Board Certified Behavior Analyst (BCBA) is supervising two Registered Behavior Technicians (RBTs) who are collecting interobserver agreement (IOA) data for a client’s motor stereotypies using interval recording. For three consecutive 15-minute intervals, RBT A recorded counts of 3, 1, and 5, while RBT B recorded counts of 4, 2, and 5 for the same intervals. To ensure accuracy and consistency in data collection, the BCBA needs to calculate the mean count per interval IOA for this data set. What is the mean count per interval Interobserver Agreement (IOA) for this data set, rounded to the nearest whole percentage?

A) 66

B) 75

C) 83

D) 100

To calculate the mean count per interval IOA you must first calculate the percentage of agreement for each individual interval This is done by dividing the smaller count by the larger count within each interval and then multiplying by 100 to get a percentage Interval 1 RBT A 3 RBT B 4 Agreement 3 4 100 75 Interval 2 RBT A 1 RBT B 2 Agreement 1 2 100 50 Interval 3 RBT A 5 RBT B 5 Agreement 5 5 100 100 Next sum these individual interval percentages 75 50 100 225 Finally divide the sum by the total number of intervals 3 to find the mean 225 3 75 This method provides an average of the agreement percentages across all observed intervals offering a comprehensive measure of consistency in data collection

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