This package provides a collection of functions for two satge joint modeling of longitudinal and survival data using various methods such as Complete case,Last Observation Carried Forward, Multiple Imputation (MI), Inverse Probability Weighted (IPW). It supports the modeling of time-dependent covariates in survival analysis and allows for flexible imputation techniques to handle missing data. The package is designed for use in survival analysis with longitudinal biomarkers, providing tools for both model fitting and evaluation.