This example applies survival, discriminant, and regression analyses, and reliability principles to the study and assessment of the efficient life of a Covid-19 vaccine. Data was made up, as we have no access to real one. This is part of our proposal (https://web.cortland.edu/matresearch/Covid-19Proposal2020.pdf) to contribute to defeat the Covid-19 scruge. You can read said tutorial example in:
https://www.researchgate.net/publication/344495955_Survival_Analysis_Methods_Applied_to_Establishing_Covid-19_Vaccine_Life------------------------------
Jorge L. Romeu
Emeritus SUNY Faculty
Adjunct Professor, Syracuse U.
https://www.researchgate.net/profile/Jorge_Romeu------------------------------