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Results
#1. An RBT and a BCBA simultaneously collected count data for a client’s target behavior across three separate observation intervals during a session. Their recorded counts were as follows Interval 1 RBT Count 3, BCBA Count 4 Interval 2 RBT Count 1, BCBA Count 2 Interval 3 RBT Count 5, BCBA Count 5 Based on this provided data, accurately calculate the Mean Count Per Interval Interobserver Agreement (IOA).
To accurately calculate the Mean Count Per Interval IOA you must first determine the agreement percentage for each individual interval This is achieved by dividing the smaller count by the larger count within each interval and then multiplying by 100 to convert it to a percentage Once each intervals agreement is calculated you average these percentages across all intervals Here are the stepbystep calculations 1 Calculate IOA for Interval 1 Smaller count Larger count 100 3 4 100 075 100 75 2 Calculate IOA for Interval 2 Smaller count Larger count 100 1 2 100 050 100 50 3 Calculate IOA for Interval 3 Smaller count Larger count 100 5 5 100 100 100 100 4 Calculate the Mean Average IOA across all intervals Sum of individual interval IOA percentages 75 50 100 225 Mean Count Per Interval IOA Total percentage Number of intervals 225 3 75 This method of IOA calculation provides a precise measure of observer agreement on a momenttomoment or intervalbyinterval basis which is often preferred when assessing the reliability of count data collected across specific time segments
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