Stats
Survival Analysis
https://en.wikipedia.org/wiki/Survival_analysis
https://en.wikipedia.org/wiki/Survival_function
https://en.wikipedia.org/wiki/Failure_rate
https://en.wikipedia.org/wiki/Degenerate_distribution
https://en.wikipedia.org/wiki/Log-normal_distribution
https://en.wikipedia.org/wiki/Hypertabastic_survival_models