Inter-rater Reliability: What It Is, Why It Matters, and How to Improve It
Understanding Inter-rater Reliability Inter-rater reliability (IRR) measures how consistently different observers or raters assess the same event, behavior, or data set. When multiple raters evaluate the same thing, high inter-rater reliability shows they are applying the same criteria, leading to reliable results. This concept is crucial in research, clinical assessments, and performance reviews because inconsistent…