Foundational analyses
This protocol is extracted from research article:
Portals to frailty? Data-driven analyses detect early frailty profiles
Alzheimers Res Ther, Jan 4, 2021; DOI: 10.1186/s13195-020-00736-w

The following foundational analyses served the purpose of testing and confirming basic characteristics of the neurocognitive speed data, as well as preparing the latent variable: (a) confirmatory factor analysis, (b) longitudinal measurement invariance tests, and (c) unconditional latent growth modeling. Further details are presented in the Supplementary Methods, Additional File 1.

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