The Verbal Expression (VE) score is used to determine qualifications for many military jobs in all the branches, and it’s used to help determine your AFQT score. To compute your VE score, the military adds the number correct (1 point per correct answer) of the Paragraph Comprehension (PC) and the Word Knowledge (WK) subtests and then compares the results to the info in the following table.
The IRT model underlying ASVAB scoring is the three-parameter logistic (3PL) model. The 3PL model represents the probability that an examinee at a given level of ability will respond correctly to an individual item with given characteristics. Specifically, the item characteristics represented in the 3PL model are difficulty, discrimination (i.e., how well the item discriminates among examinees of differing levels of ability), and guessing (i.e., the likelihood that a very low ability examinee would respond correctly simply by guessing).