P4‐615: MULTIPLE FACTOR ANALYSIS OF NEUROPSYCHOLOGICAL TEST BATTERY CHANGE IN THE NATIONAL ALZHEIMER'S COORDINATING CENTER UNIFORM DATA SET. (1st July 2019) - Culhane, Jessica E.; Gary Chan, Kwun Chuen; Teylan, Merilee; Chen, Yen-Chi; Gauthreaux, Kathryn; Mock, Charles; Kukull, Walter A.