HGL = (W4/10) to (W5/10) W4 and W5 are the number of words in four and five sentences respectively. Let me demonstrate with three of my readability formulae: HGL (Higher Grade Level), CCI (Character-Count Index) and SI (Strain Index). And now I see that the average reading grade is connected to the average sentence length. In two of my articles ‘The Average Sentence Length’ and ‘Syllable, Word and Sentence Length’, I have come to the conclusion that the average sentence length has 17 words, 29 syllables and 87 letters. ![]() This means that the average child will be able to pronounce correctly about 80 of the words in the Schonell Reading Test. reads at the middle-school level, roughly at the 8 th grade level.” ( Smart Language, 2007). And William DuBay states: “The average adult in the U.S. ![]() Here is the 10 th guideline of Martin Cutts: “Remember the average reading age of the population: about 13 years.” ( Oxford Guide To Plain English, 3 rd edition, 2009). Martin Cutts and William DuBay are agreed on the average reading age/grade. If C is the number of words correctly pronounced by a child, then RA = (C/10) + 5 and RG = C/10. ![]() The Schonell Reading Test consisting of a list of 100 words from the monosyllabic ‘tree’ to the polysyllabic ‘idiosyncracy’ helps evaluate the RA as well as the RG of a child. Both are related concepts tied by this conversion formula: RA = RG + 5. ( Age (RA) and Reading Grade (RG) are measures of literacy in the U.K.
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