Example of the Interpretation of the RPI

Tommy, a second grade boy, obtained a Standard Score of 92 and a Percentile Rank of 30 on the Letter-Word Identification test. His RPI score was a 62/90. These scores suggest that, even though many other second-graders (30%) demonstrated equally limited or more limited sight vocabularies, Tommy's skills were nonetheless deficient compared to the average proficiency of second graders. He requires additional attention in sight word acquisition.