Factorial Invariance of UDS Neuropsychological Test Battery Note: An Official Proposal has not been Submitted to NACC. Lead Investigator: Dan Mungas Institution : UC Davis E-Mail : dmmungas@ucdavis.edu Proposal ID : 1748 Proposal Description: Aim 1. Develop confirmatory factor analysis (CFA) models of optimal factor structure for UDS version 2 and version 3 neuropsychological test batteries. Aim 2. Test for factorial invariance across UDS 2 and 3 neuropsychological test batteries. Aim 3. Test for factorial invariance across racial/ethnic groups. Aim 4. Evaluate factorial invariance across longitudinal assessments.