Statistics and Probability Dictionary

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T Score

The term t score has different meanings in different settings:

  • In introductory statistics, t score is often used synonomously with t statistic.
  • In psychometrics, a t score is a type of standard score computed by multiplying a z score by 10 and adding 50.
  • In bone density tests, a t score compares bone mineral density to a reference mean.

Often, the meaning is clear from the context. In educational research, the psychometric definition generally applies. In papers on osteoporosis, the bone density definition is probably the intended definition.

Sometimes, though, the meaning is not clear. Some statistics texts use the term to mean "t statistic". Others use the psychometric definition.

To avoid confusion, the Stat Trek website avoids the term "t score". It uses "t statistic", instead.

See also:  Student's t Distribution