District Average—The average RIT score for all students in the school district in the same grade who
were tested at the same time as this student.
Lexile—A Lexile is a unit for measuring text difficulty. This unit is linked to the reading RIT score. By determining the level of text difficulty students can comprehend, Lexiles can be used to determine student reading ability.
MAP— Measures of Academic Progress (MAP) are a series of computerized adaptive tests that measure a student’s general knowledge in reading, language usage, mathematics and science.
Norm Group Average—The average score observed for students in the norm group.
Percentile Range—Percentiles are used to compare one student’s performance to that of the norm group.
Percentile means the student scored as well as or better than that percent of students taking the test in his/her grade. There is about a 68% chance that a student’s percentile ranking would fall within this range if the student tested again relatively soon.
Percentile Rank—The percentile rank is a normative statistic that indicates how well a student performed in comparison to the students in the norm group. The most recent norm sample was a group of over 2.3 million students from across the United States. A student’s percentile rank indicates that the student scored as well as, or better than, the percent of students in the norm group. In other words, a student with a percentile rank of 72 scored as well as, or better than 72% of the students in the norm group.
RIT—Tests developed by NWEA use a scale called RIT to measure student achievement and growth. RIT
stands for Rasch UnIT, which is a measurement scale developed to simplify the interpretation of test
scores. The RIT score relates directly to the curriculum scale in each subject area. It is an equal-interval
scale, like feet and inches, so scores can be added together to calculate accurate class or school averages.
RIT scores range from about 140 to 300. Students typically start at the 140 to 190 level in the third grade
and progress to the 240 to 300 level by high school. RIT scores make it possible to follow a student’s
educational growth from year to year.
Standards— Standards are statements, developed by states or districts, of what students should know and
be able to do, related to specific academic areas.