If you were not a Mathematician you might think that all Mathematicians are pretty much the same, however, there are three main strands to the Maths that gets taught at University. Pure, Mechanics and Statistics. A bit like Science splits into Biology, Chemistry and Physics. Pure is Algebra, proofs, very abstract things like that, whereas, Statistics is all about analysing data from the real world. Someone who was very accomplished at Pure Maths would, nevertheless, be a total beginner at Statistics as the skills and knowledge aren’t really transferable.
What we have here is a classic case of someone who is an expert in their own field, switching to a different field, forgetting they are no longer an expert, yet, still being supremely confident in their own judgement and opinion. A good analogy would be someone who does a Physics degree up to Quantum Mechanics level who then moves over to Biology. They need to go right back to the beginning and start to quietly learn the different parts of a cell. Imagine if they started to loudly disagree with accepted Biological opinion after a week of lessons. Yet, Professor Coe does disagree with accepted Statistical opinion. No Mathematician uses the Effect Size.
Professor Coe did a Pure Maths degree which had no statistics in it.
John Hattie did an Arts degree which had no statistics in it.
There’s a very simple reason they advocate the use of statistics you won’t find in any Maths textbook, their degrees contained no statistics.
Nobody in Maths uses the Effect Size.
Can we stop yet?