Understanding Measurement Reliability and Validity A concerned parent takes their child to a psychologist to be assessed for ADHD. The clinician runs a battery of tests and concludes the child has the disorder. Seeking a second opinion, the parent visits a different psychologist a week later. Using the same tools, this new clinician concludes the
Cohen’s Kappa Explained: Measuring Reliability in Psychology Research Imagine a patient named Sarah. She visits Dr. A because she’s been feeling persistently low, tired, and unmotivated. Dr. A conducts an assessment and diagnoses her with Major Depressive Disorder. Seeking a second opinion, Sarah visits Dr. B the following week. Dr. B asks similar questions but
Is Your Research Reliable? Understanding Fleiss’ Kappa Imagine you are the lead clinical psychologist at a busy diagnostic center. A new patient walks in displaying complex symptoms. You ask three different clinicians to assess this patient independently to determine if they meet the criteria for Major Depressive Disorder. Doctor A says “Yes.” Doctor B says