Before revision: Hattie himself admitted that half of the statistics in Visible Learning were calculated incorrectly throughout the book .John Hattie admits that half of the Statistics in Visible Learning are wrongTopphol, Arne Kåre.
After revision: Hattie himself admitted that the values for the Common language effect size (CLE), with only the values for cohen's d being correct in Visible Learning were calculated incorrectly throughout the book .John Hattie admits that half of the Statistics in Visible Learning are wrongTopphol, Arne Kåre.