Estimate Location-Scale Joint Models // Estimation of mixed models including a subject-specific variance that can be time- and covariate-dependent or defined for within- and between- visit variability. In the joint modeling framework, the package handles left truncation, interval censoring, and multistate models, and allows a flexible dependence structure between competing events and the longitudinal marker. Estimation is performed in a frequentist framework using the Marquardt- Levenberg algorithm. Methods are described in Courcoul et al. (2025) doi:10.1002/sim.70244 and in Courcoul et al. (2026) doi:10.1002/bimj.70123.