Measurement bias
When an observer’s measurement is influenced by an expectation or belief they hold rather than what actually occurred.
C. Measurement, Data Display, and Interpretation
Median level line
A horizontal line on a line graph established by calculating the median of the graphed data points, used to signify the degree to which data points converge on the y-axis.
6th Edition TCO
Momentary time sampling
A time-sampling data collection method used to estimate the overall occurrence of a behavior by measuring the number of intervals during which the behavior occurs at the end of an
Observer drift
When observers collecting data have a shift/drift in how they interpret the operational definition of the target behavior that affects the validity of their data.
Observer reactivity
When an observer’s data collection or performance is influenced by the awareness that they are being monitored and evaluated.
Occurrence data
A measurement of behavior that represents its repeatability and countability.
6th Edition TCO
Operational definition
An objective, clear, and complete description of target behavior.
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6th Edition TCO
Partial interval recording
A time-sampling data collection method used to estimate the overall occurrence of a behavior by measuring the number of intervals during which the behavior occurs at any time within an
Percentage
A derived measure of behavior that depicts the proportional quantity of the number of times the behavior occurred out of the total number of opportunities for that behavior to occur
6th Edition TCO
Planned activity check
A time-sampling data collection method used to estimate the overall occurrence of behaviors of a group of individuals by measuring the number of intervals during which the behavior occurs at
Product measures
A measurement of a target behavior taken by measuring the lasting environmental changes produced by that behavior, rather than counting actual occurrences of the behavior. (E.g., test scores, completed chores,
Quarterly intersect line of progress
A method of analyzing the trend of the data on a line graph that involves dividing the data into two equal parts and establishing intersections for mid-rate and mid-date points
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