If you’ve ever had to analyze survey results, measure psychological traits, or validate a questionnaire, chances are you’ve come across Cronbach’s alpha. It’s one of the most commonly used reliability coefficients in research, but here’s the thing—most people misunderstand it. Some treat it as the gold standard for reliability when, in reality, it has…
John Carlyle Raven (1902–1970) wasn’t just another psychologist—he was a game-changer in the world of intelligence testing. His name might not be as instantly recognizable as Freud or Pavlov, but if you’ve ever taken a nonverbal IQ test, especially one that involves patterns and logic, you’ve seen his influence firsthand. Raven’s Progressive Matrices (RPM)…
Robert Mearns Yerkes was one of those names that had a massive impact on psychology, but not always for the right reasons. Born in 1876 and passing in 1956, he left behind a complicated legacy—one filled with groundbreaking work in intelligence testing, pioneering research in primatology, and, unfortunately, a strong connection to the eugenics…
