"Madelyn observed her client and marks an interval box if the behavior occurs at any point during the interval. Madelyn is using "partial interval recording".
"Partial interval recording" is described as when the observer is focused on the behavior that is happening or not in any fragment of the interval, this behavior generally does not occupy the whole interval. More short the interval is, more appropriate the data will be and not the more work that is needed by the observer. Interval size must be based on appropriate "baseline of rates" of behavior."
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