Occasions of measurement refer to the number of times a variable is measured across time. A single method (rating scale) with a single source (parent) at a single time point provide little information about the time course of the particular problem. The behavior could be stable, increasing, or decreasing as well as changing rapidly or slowly across time. Given the dynamic nature of behavior (i.e., the modes and dimensions of a behavior problem can change across time) and the dynamic nature of controlling conditions for the behavior, a more complete understanding of the behavior problem occurs with multiple measurements across time (time-series measurement procedures).
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