Like if you take an object out of one box and put it in a different box, it looks different superficially, but the object itself and its meaning (e.g., weight) have not changed. My undergraduate professor who introduced me to psychometrics used the term “repackaging” to describe scaled scores. It is simply a conversion to round, positive numbers, that is easier to digest and less likely to upset someone that is unfamiliar with psychometrics. Since there is a 1-to-1 mapping of T Score to the other rows, you can see that it does not actually provide any new information. The SAT has a scale of mean=500 SD=100 (T score x 10), so if you receive a score of 400 it again means that you are z=-1 or percentile of 16.Ī 70 means that you are approximately the 98th percentile – so that it is actually quite high though students who are used to receiving 90s will feel like it is low! It is for the same reason that many educational assessments use other scaled scores. This is a low score, obviously, but a student will feel better than if they received a score if -1. The image below shows the normal distribution, labeled with the different scales for interpretation.Īs you can see above, a T Score of 40 means that you are approximately the 16th percentile. Scores are round numbers that generally range from 0 to 100, depending on whether 3, 4, or 5 standard deviations is the bound (usually 20 to 80) this somewhat fits with what most people expect from their school days, even though the numbers are entirely different.There are no negative scores people generally do not like to receive a negative score!.Doing so has two immediate benefits to most consumers: We simply convert this to have a mean of 50 and standard deviation of 10. The normal distribution places observations (of anything, not just test scores) on a scale that has a mean of 0.00 and a standard deviation of 1.00. What is a T Score?Ī T score is a conversion of the standard normal distribution, aka Bell Curve. ![]() Therefore, a T Score is a standardized way that scores are presented to make them easier to understand. ![]() A scaled score is simply a way to present scores in a more meaningful and easier-to-digest context, with the benefit of hiding the sometimes obtuse technicalities of psychometrics. ![]() Lecture Notes – Online Course in Psychometrics and AssessmentĪ T Score (sometimes hyphenated T-Score) is a common example of a scaled score in psychometrics and assessment.TestAssembler (Automated Form Assembly).Training, Workshops, Support, and Implementation.
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