Classic readability formulas correlate weakly with human readability judgments for plain-language summaries (FKGL r=0.16), the best LLM judge reaches r=0.56, and the two evaluator families rank datasets nearly opposite.
Chang, and Nazli Goharian
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Evaluating the Evaluators: Are readability metrics good measures of readability?
Classic readability formulas correlate weakly with human readability judgments for plain-language summaries (FKGL r=0.16), the best LLM judge reaches r=0.56, and the two evaluator families rank datasets nearly opposite.