Like so many of the others on this forum, I've had terrible sinus headaches after having a root canal done 3 weeks ago. It started as soon as the Novocaine wore off. It was almost unbearable for the first 2 days. It began around my right eye and nose (the root canal was in my upper right side).
Survival analysis is generally defined as a set of methods for analyzing data where the outcome variable. is the time until the occurrence of an event of interest. The event can be death, occurrence of a disease, marriage, divorce, etc. The time to event or survival time can be measured in days, weeks, years, etc.
Self preservation is essentially the process of an organism preventing itself from being harmed or killed and is considered a basic instinct in most organisms. Most call it a survival instinct. Self-preservation is thought to be tied to an organisms reproductive fitness and can be more or less present according to perceived reproduction potential. If perceived reproductive potential is low enough, self-destructive behavior(the opposite) is not uncommon in social species.