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Results

#1. A BCBA instructed an RBT to collect whole interval data on a client’s target behavior of ‘sitting in the chair without standing up.’ The observation session was divided into 20-second intervals. The RBT recorded the following durations for the client sitting without standing within eight consecutive 20-second intervals Interval 1 19 seconds, Interval 2 8 seconds, Interval 3 9 seconds, Interval 4 19 seconds, Interval 5 18 seconds, Interval 6 4 seconds, Interval 7 19 seconds, Interval 8 12 seconds. Based on this whole interval data, how many responses should the RBT report for the client sitting in the chair without standing up?

8 responses

4 responses

1 response

0 responses

Whole interval recording is a discontinuous measurement procedure where an interval is marked as an occurrence only if the behavior occurs throughout the entire duration of the interval In this scenario the target behavior is sitting in the chair without standing up and the intervals are 20 seconds long For a response to be counted the client must sit in the chair without standing for the full 20 seconds of an interval Looking at the provided data 19 seconds 8 seconds 9 seconds 19 seconds 18 seconds 4 seconds 19 seconds and 12 seconds none of these durations reach the full 20 seconds required for an occurrence to be recorded Therefore the RBT should report 0 responses This example also highlights a known limitation of whole interval recording it often underestimates the true occurrence of behavior especially if the behavior does not sustain for the entire interval

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