![]() In some cases the raters may have been trained in different ways and need to be retrained in how to count observations so they are all doing it the same. If the raters significantly differ in their observations then either measurements or methodology are not correct and need to be refined. It is important for the raters to have as close to the same observations as possible - this ensures validity in the experiment. Examples of raters would be a job interviewer, a psychologist measuring how many times a subject scratches their head in an experiment, and a scientist observing how many times an ape picks up a toy. ![]() A rater is someone who is scoring or measuring a performance, behavior, or skill in a human or animal. ![]() Inter-Rater Reliability refers to statistical measurements that determine how similar the data collected by different raters are.
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