AP PSYCHOLOGY

Detailed explanation-1: -The kappa statistic is frequently used to test interrater reliability. The importance of rater reliability lies in the fact that it represents the extent to which the data collected in the study are correct representations of the variables measured.

Detailed explanation-2: -The Kappa Statistic or Cohen’s* Kappa is a statistical measure of inter-rater reliability for categorical variables. In fact, it’s almost synonymous with inter-rater reliability. Kappa is used when two raters both apply a criterion based on a tool to assess whether or not some condition occurs.

Detailed explanation-3: -The formula for Cohen’s kappa is the probability of agreement minus the probability of random agreement, divided by one minus the probability of random agreement.

Detailed explanation-4: -Cohen’s Kappa coefficient, which is commonly used to estimate interrater reliability, can be employed in the context of test–retest. In test–retest, the Kappa coefficient indicates the extent of agreement between frequencies of two sets of data collected on two different occasions.