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This study analyzed the prevalence and characteristics of low-frequency and rare words, together described as rarer words, in elementary-level texts, examining both narrative and expository materials to assess their vocabulary demands. By mapping the nature of shifts in rarer words across grade levels and text types, this research aimed to better understand the lexical challenges students face as they progress as readers. Analyzing a corpus of 300,000 words from narrative and expository texts at grades 1, 3, and 5, the research employed both quantitative and qualitative methods. Quantitatively, a digital program categorized words into four frequency groups—high, medium, low, and rare—while examining features of word length and age of acquisition that can influence word meaning recognition. Qualitatively, the analysis classified rarer words into 13 lexical categories and assessed their morphological family membership. The findings reveal an increase in total rarer words from 5.7% to 8.7% across grades, alongside a major rise in unique rarer words (32% to 43%). The complexity of features predicting word recognition—word length and age of acquisition—also escalates with grade level. Notably, 23% of rarer words are forms typically not taught in vocabulary instruction, such as proper names, while 76% of rare words belong to morphological families in the high-, medium-, and low-frequency word zones. These results highlight the need for targeted vocabulary instruction that incorporates the complexities of rarer word usage in authentic texts, ultimately aiming to enhance students’ reading comprehension.
Hiebert et al. (Fri,) studied this question.