Validity
Measurement is trustworthy when the measurement that produces data is applicable and specific to the target behavior of interest and the relevant dimension of that behavior; in other words, you …
Task List Reference: C-8
Evaluate the validity and reliability of measurement procedures.
Accuracy
Measurement is trustworthy when the degree to which what was quantitatively measured (observed value) is representative of what actually occurred (true value); in other words, the data collected accurately represents …
Reliability
Measurement is trustworthy when the degree to which repeating a measurement procedure under the same conditions produces the same result.
Measurement artifact
Data that represents an unwarranted and misleading picture of behavior because of how it was measured, typically a product of time-sampling, limiting measurement scales, or poorly scheduled measurement periods.
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.
Measurement bias
When an observer’s measurement is influenced by an expectation or belief they hold rather than what actually occurred.
Observer reactivity
When an observer’s data collection or performance is influenced by the awareness that they are being monitored and evaluated.
Interobserver agreement (IOA)
A measurement of the degree to which two or more observers report the same values when observing and collecting data for the same behaviors/events.
Reactivity
Refers to the changes in an individual’s behavior due to the presence of an observer.