Reliability of difference scores calculator. Reliability of Difference Scores help you calculate the reliability of difference scores, given the reliability of two tests and the correlation between those two tests.
A difference score is obtained by subtracting one test score from another test score. For example, a students IQ test score and Reading test score. This might be interpreted as the difference between ability and achievement.

The license of this software is Freeware, you can free download and free use this calculator software.