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#1. A behavior analyst is supervising a new RBT who is collecting data on a client’s hand-flapping behavior using partial interval recording with one-minute intervals. After reviewing the RBT’s data, the behavior analyst observes that the data indicates hand-flapping occurred during 7 out of 10 intervals in a 10-minute session. Based on the principles of discontinuous measurement, specifically partial interval recording, what common measurement distortion is MOST likely to be represented by this data?
Partial interval recording PIR is a discontinuous measurement procedure where an observer records if a behavior occurs at any point during a specified interval Due to its nature if the behavior occurs even for a single moment within the interval it is marked as having occurred for the entire interval This characteristic leads to an overestimation of the behaviors total duration because a brief occurrence is counted as an occurrence for the full interval Conversely PIR often underestimates the total frequency or rate of behavior If a behavior occurs multiple times within a single interval it is only recorded once for that interval meaning the actual count of occurrences is missed For example if handflapping occurs for 5 seconds at the start of a 1minute interval and then again for 30 seconds later in the same interval PIR would only mark it as occurred once thus underestimating the frequency and overestimating the duration as it attributes a 5second or 30second behavior to the full minute
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