Reference

Fitting Fit NLME models and inspect results.
ferx_fit()	Fit a nonlinear mixed effects model
ferx_sir()	Run SIR against an existing fit
summary(<ferx_fit>)	Summarize a ferx fit result
Simulation & Prediction Simulate observations or compute population predictions from a fitted model.
ferx_simulate()	Simulate from a NLME model
ferx_simulate_with_uncertainty()	Simulate with parameter-uncertainty propagation
ferx_predict()	Population predictions from a NLME model
Model editing Create, inspect, and programmatically edit .ferx model files.
ferx_model()	Create a ferx_model object
ferx_model_new()	Create a new ferx model file from a skeleton template
ferx_model_edit()	Open a ferx model file in an editor
ferx_model_show()	Display a ferx model file in the console
ferx_model_inspect()	Inspect the structure of a ferx model file
ferx_model_validate()	Validate a ferx model file for syntax and structural errors
ferx_model_section()	Extract a section from a ferx model file
ferx_get_section()	Inspect a section of a ferx model (pipe-friendly)
ferx_set_section()	Replace a section in a ferx model (pipe-friendly)
ferx_model_set_section()	Replace a section in a ferx model file
Diagnostics & output Extract and visualise parameter estimates, ETAs, and optimizer traces.
ferx_estimates()	Tidy parameter estimates table
ferx_eta_cov()	ETA-covariate correlation table
ferx_cor_matrix()	Correlation matrix of estimated parameters
ferx_plot_trace()	Plot optimizer trace from a ferx fit
ferx_trace()	Read the optimizer trace from a ferx fit
Utilities Helper functions for exploring bundled examples and checking model initialisation.
ferx_example()	Get paths to example model and data files
ferx_check_init()	Quick convergence check with an optimizer trace
ferx_save_fit()	Save a ferx fit to a portable .fitrx bundle
ferx_load_fit()	Load a fit from a .fitrx bundle