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I am looking to understand what do these numbers mean in the formulas, and how do they affect results, and why they were specifically chosen. Here are the formulas:

  • Flesh reading Ease = 206.835 - 1.015*(total words) - 84.6*(total syllables/total words)
  • Flesch-Kincaid grade level = 0.39*(total words/total sentences) + 11.8*(total syllables/total words) - 15.59
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The numbers are fitted to an existing scale and have no particular meaning. They shall just reproduce an already known and gauged scale (just named "scale" in the Wikipedia article on the Flesch-Kincaid readibility tests.

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