This R-source site lists a number of useful R functions and packages that Jonggyu developed/used in his research and his collaborations with other experts.
The completed R sources:
Newton's Growth Model (NGM)
Distributed Lag Model (DLM) in the built environment health
A probit selection model for univariate outcome with missing not at random (MNAR)
Hierarchical Multiple Informants Model (HMIM)
Small Sample Generalized Estimating Equation (SS GEE)
The currently working R-sources:
Hierarchical Distributed Lag Model (HDLM) in the built environment health