An RAE cannot be directly converted into an IU without knowing the source(s) of vitamin A. For example, the RDA of 900 mcg RAE for adolescent and adult men is equivalent to 3,000 IU if the food or supplement source is preformed vitamin A (retinol).
Diploma vs Associate Degree. A Diploma is one type of certification, and an Associate degree is another type. Diploma and Associates degree, as the name specifies, are different in many aspects. There is no confusion between the two, as the difference is very specific. A Diploma can be said to be a document awarded to a student after completion of a course.
Graduate certificates vs. master's degrees. A master's degree is typically a two-year, full-time commitment beyond a bachelor's degree in a field of study. Students can obtain a Master of Arts or Science or a degree that is more specialized, such as a master of social work, or MSW, or a Master of Business Administration, or MBA. On the other hand, a graduate certificate -- also called a diploma -- is a short program of study in a particular subject.