The vlda is an R (R Development Core team et al., 2011) package which provides functions for visualization

of multidimensional longitudinal data. In particular, the R package vlda was developed to assist in producing

a plot that more e?ectively expresses changes over time for two di?erent types (long format and wide format)

and uses a consistent calling scheme for longitudinal data. The main features of this package allow us to identify

the relationship between categories and x-x-objects using an indicator matrix with x-x-object information, as well as to

cluster x-x-objects. The R package vlda can be used to understand trends in observations over time in addition to

identifying relative relationships at a simple visualization level. It also o?ers a new interactive implementation to

perform additional interpretation, therefore it is useful for longitudinal data visual analysis. Due to the synergistic

relationship between the existing VLDA plot and interactive features, the user is empowered by a re?ned observe

the visual aspects of the VLDA plot layout. Furthermore, it allows the projection of supplementary information

(supplementary x-x-objects and variables) that often occurs in longitudinal data of graphs. In this study, practical

examples are provided to highlight the implemented methods of real applications.

Keywords: vlda, visualization, longitudinal data, R