Read Chapter 5 (pp. 102–124) of the Cooper, Heron, and Heward (2007) text.:
- Kazdin, A. E. (1977). Artifact, bias, and complexity of assessment: The ABCs of reliability. Journal of Applied Behavior Analysis, 10, 141–150.
- Watkins, M. W., & Pacheco, M. (2001). Interobserver agreement in behavioral research: Importance and calculation.Journal of Behavioral Education, 10, 205–212.
- Wirth, O., Slaven, J., & Taylor, M. A. (2014). Interval sampling methods and measurement error: A computer simulation. Journal of Applied Behavior Analysis, 47, 83–100.

Reliability in behavioral assessment is derived through the calculation of interobserver agreement. Describe how interobserver agreement can be impacted by such issues as reactivity, observer drift, observer bias, complexity of response codes, and expectancy bias. End your post with a description of methods for calculating interobserver agreement and the various issues associated with the calculation methods.

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In behavioral assessment, reliability is derived through the calculation of interobserver agreement (Cooper, Heron, and Heward, 2007). Interobserver agreement can be impacted by many issues. The first one is reactivity, an error in measurement that results from an observer’s awareness that others will be evaluation the data he/she reports. This is similar to reactivity of participants when they are aware their behavior is being observed by others. During a study, an interobserver agreement is usually checked periodically. The observers are usually aware when their observations checks occur, by seeing another observer entering the situation or by observing...

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