Latent transition analysis (LTA) and latent class analysis (LCA) are closely related methods. LCA identifies unobservable (latent) subgroups within a population based on individuals’ responses to multiple observed variables. LTA is an extension of LCA that uses longitudinal data to identify movement between the subgroups over time.

Our research on LTA allows scientists to better understand the impact of exposure to multiple risks and the nature of changes in complex behaviors, particularly when change can be represented as movement between discrete categories or stages. This makes it possible to identify groups of at-risk individuals. We also distribute PROC LTA, a free, easy-to-use SAS procedure for LTA.

Introductory Example: Changes in Teen Sexual Risk

In this example, LTA reveals five profiles of teen/young adult sexual behavior. The analyses indicate which youth are more likely to transition to higher risk behavior over the course of two years. By applying LTA, interventions can be developed to target youth most at risk of initiating high-risk sexual behavior.

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