Applying the crosswalk study to NACC data and improving crosswalk methods Lead Investigator: Jianqiao Wang Institution : NACC and Peking University E-Mail : 1500017822@pku.edu.cn Proposal ID : 1091 Proposal Description: We want to improve the methods used in the crosswalk study. Additionally, we intend to create a method to apply the results from the crosswalk study to the NACC dataset so that investigators may have a continuous, longitudinal measure of cognitive decline for participants who have been given the C1 battery in the past and the C2 battery in UDSv3 follow-up visits.