Some of the statistical methods used by Hattie have been criticised. 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. 2011. Kan vi stole på statistikkbruken i utdanningsforskinga? Norsk pedagogisk tidsskrift 06 / 2011. ('Can we rely on the use of statistics in education research? Norwegian journal of paedagogy' in Norwegian)An email exchange between John Hattie and members of the Student Committee of the teacher-training programme at the University of Oslo (in English), Response to Hattie's response by Topphol (in English)
Some of the statistical methods used by Hattie have been criticised. Hattie himself admitted that his calculation of the Common Language Effect Size (CLE), which was meant to facilitate interpretation of the more common effect size d in Visible Learning , was done incorrectly throughout the book.John Hattie admits that calculation of the CLE statistic in Visible Learning was wrongTopphol, Arne Kåre. 2011. Kan vi stole på statistikkbruken i utdanningsforskinga? Norsk pedagogisk tidsskrift 06 / 2011. ('Can we rely on the use of statistics in education research? Norwegian journal of paedagogy' in Norwegian)An email exchange between John Hattie and members of the Student Committee of the teacher-training programme at the University of Oslo (in English), Response to Hattie's response by Topphol (in English)
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