How do Lexile measures compare with Fountas & Pinnell Text Level Gradient?
The correlation between the Fountas & Pinnell reading levels and Lexile measures for books in the early reader range is very strong (rs = 0.84). This indicates a strong positive relationship between the ordering of the two text leveling systems. As the Fountas & Pinnell levels increase, so do the Lexile measures for the books. Because Fountas & Pinnell reading levels are categorical variables (i.e. letter categories) and Lexile measures are continuous variables (i.e. numbers from below 0L to 1600L not divided into specific groups), some variation in the Lexile measures of books within Fountas & Pinnell reading levels is expected. Variation between the systems also occurs because the two systems rely on different, though overlapping sets of text characteristics when determining text complexity. To learn more about the analysis of early reader texts and the correlation between the Fountas & Pinnell Text Level Gradient system and the Lexile Framework, see our Research Brief, “The Relationship between Lexile Text Measures and Early Grades Fountas & Pinnell Reading Levels.”