What is RIT?
RIT or “Rasch Units” are units of measurement involving the difficulty of individual items to give an estimate for what a particular student has achieved. Scores that students get from this particular test are called RIT scores and these scores are validated using the RIT scale.
The RIT scale concept is developed by George Rasch who happened to be a mathematician. He formulated the scale in a way that information is gathered and analyzed using the actual performance of individual students in specific and individual test items.
The RIT scale is used in many school curriculums because it offers the advantage of relating scale numbers to the item difficulty in a particular test. RIT scores are also consistent in the sense that it measures a student’s performance or achievement with the same interpretation across all grade levels. Differences in RIT scores remain the same even if a particular student is at the bottom, middle, or top of the RIT scale.
Besides being an accurate achievement and equal interval scale, the RIT scale is also considered progressive because it can measure achievement growth over time. As a particular student grows older and goes to the next educational grade level, RIT scores will literally “grow” with them. This means that at any grade level, the RIT scores can be interpreted the same. And if a particular student for example got a 200 point RIT score when he/she is in grade two and got 210 points after taking the test again at grade three, it simply means that his/her academic performance increased by a total of 10 points or 10 RITs.
But RIT scores should not be used to compare one student with another. Instead, these scores are used to check if a particular student has “grown” academically. These scores represent individual performance on individual items so similar scores with other students doesn’t necessarily mean similar achievement.