Powers-Sumner-Kearl 公式は、小学校レベルのテキストを読むために必要な米国学年を推定。Spache や Dale-Chall と自然に組み合わせ可能。
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Use Powers-Sumner-Kearl for elementary text. It pairs naturally with Spache for K-4 readers and Dale-Chall for grades 4-8. Originally a simplified variant of Flesch designed for primary education.
PSK is one of three primary-grade formulas (with Spache and Dale-Chall). The three together provide consensus for elementary text. PSK is the simplest and fastest of the three.
Powers-Sumner-Kearl is a simplified Flesch variant from 1958: 0.0778 × avg sentence length + 0.0455 × syllables-per-100-words − 2.2029.
It outputs a grade level calibrated for primary education (grades 1-6).
Use alongside Spache and Dale-Chall for a primary-grade consensus.
Same inputs (sentence length + syllables) with different coefficients. PSK is calibrated for primary grades; FK extends through college.
For elementary text (grades 1-6), PSK is better calibrated. For older audiences, use Flesch-Kincaid.
In academic reading research, yes. In commercial writing, Flesch-Kincaid dominates. PSK shines as a third opinion for primary text.
入力
A 50-word elementary text with short sentences and one-syllable words.
出力
PSK grade 2.8 — primary.
Short sentences (avg 8 words) and low syllables-per-100 (110) place this firmly in early elementary range.