How do Lexile Levels correlate to F&P Levels?
There may be a statistical correlation between Lexile levels and F & P levels. For example, if you run measures on thousands of books and over many levels, there would be a correlation. We have not performed these analyses ourselves. The lower F & P levels, in general, would have lower Lexile scores. The higher F & P levels generally would have higher scores. But this kind of correlation is not the same as a precise matching of levels, for example, a Lexile range of numbers corresponds to a specific A to Z level in a reliable way. The two systems are based on some of the same text factors but not all. Metametrics uses a mathematical formula, which they can explain. The F & P levels are based on the ten text factors named in several of our books. A group of raters reach reliability after independent analysis. We can not say with high prediction that a given book with a certain Lexile score will fall into a category on the F & P gradient.
