Introduction | Theory | Gompertz curve | Dynamic Gompertz model | State space form and estimation | Forecasts and peak prediction | Reproduction Number $R_t$ | Reinitialization | Reinitalizing the data series | Reinitalizing the model | Functionality of tsgc | Illustration of the tsgc package | Setting up the forecasting exercise | Estimation | Results | Triggering reinitialization | Estimating the reinitialized model | Conclusions | Acknowledgements | References | Appendix: Incorporating seasonal terms into the state space model