[chuckcode]

Don't get distracted by the click bait title. Effect size should be captured by statistical significance (larger effects are less likely to happen by chance). Author is really complaining that the original study didn't report enough data to check their analysis or do alternative analysis methods. Better title for article would be "Hard to peer review when you don't share the data"

[jrk]

Note the point in the essay that statistical significance is meaningless if the model does not correspond to reality — which, in this case as in many, they very much do not.