I am not sure if this is what you are looking for but this is what is in the 2016 ADA DAT Guide
DAT scores are based on the number of correct responses obtained; applicants are not penalized for guessing. DAT results are reported in terms of scale scores. These scale scores are neither raw scores (number correct) nor percentiles. The conversion of raw scores to scale scores is accomplished using equating procedures. Using scale scores, it is possible to compare the performance of one applicant with the performance of all applicants. Scores used in the testing program range from 1 to 30. There are no passing or failing scores; a scale score of 18 typically signifies average performance on a national basis. Each test includes questions that enable the DAT Program to place different forms of the test on a common measurement scale, thereby adjusting the forms for differences in form difficulty level. Because of this adjustment, applicant scores have the same meaning regardless of the test form that was administered.