In an observational study where a team of researchers collect data on classroom behavior, interrater reliability is important: all the researchers should agree on how to categorize or rate different types of behavior. You use it when data is collected by researchers assigning ratings, scores or categories to one or more variables, and it can help mitigate observer bias. Interrater reliability (also called interobserver reliability) measures the degree of agreement between different people observing or assessing the same thing. Remember that changes or recall bias can be expected to occur in the participants over time, and take these into account.
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