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#1. A BCBA is utilizing partial interval recording (PIR) to measure a student’s off-task behavior during independent work sessions in a classroom. The observation intervals are consistently set for one minute. The BCBA’s protocol dictates that if the student exhibits any off-task behavior for even a single second within a one-minute interval, the entire interval is marked as an occurrence of off-task behavior. Given this inherent characteristic of PIR, which dimension of behavior is MOST likely to be systematically overestimated when using this specific measurement method?
Partial interval recording PIR is a discontinuous measurement procedure where an interval is marked as an occurrence if the behavior happens at any point during that interval no matter how brief This methodology has wellknown limitations regarding the accuracy of representing the actual occurrence of behavior across all dimensions Because a behavior only needs to occur for a fraction of the interval eg 1 second in a 60second interval to be recorded as present for the entire interval PIR tends to systematically overestimate the total duration of the behavior For example if a behavior occurs for just 5 seconds within a 60second interval PIR would record it as if it occurred for the full 60 seconds When this happens across multiple intervals the perceived total time the behavior occurred is significantly inflated Conversely PIR tends to underestimate the total frequency or count of behavior as multiple distinct occurrences within a single interval are only counted as one Rate which is frequency over time would also likely be underestimated if frequency is underestimated Latency which is the time from the onset of a stimulus to the initiation of a response is not directly measured by PIR Therefore out of the given options duration is the behavioral dimension most susceptible to systematic overestimation by partial interval recording due to its any part of the interval rule
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