Before revision: It had been repeatedly pointed out since (Cohen, 1962 ) that most psychological studies have low power (true positive rate), but low power persisted for 50 years indicating structural and persistent problem in psychological research.
After revision: It had been repeatedly pointed out since (Cohen, 1962 ) that most psychological studies have low power (true positive rate), but low power persisted for 50 years , indicating a structural and persistent problem in psychological research.