Jatkoanalyysin

Jatkoanalyysin, also known as continuation analysis, is a statistical method used to analyze the duration of time until an event occurs. It is particularly useful in survival analysis, where the focus is on the time to an event of interest, such as death, failure, or recovery. The method is based on the assumption that the hazard rate, or the risk of the event occurring, can change over time.

In jatkoanalyysin, the data is typically right-censored, meaning that for some individuals, the event of interest has not occurred by the end of the study period. This is common in longitudinal studies where participants may drop out or the study may end before the event occurs for all participants.

The Cox proportional hazards model is a commonly used method in jatkoanalyysin. It allows for the estimation of the hazard rate as a function of time and covariates, and it can handle right-censored data. The model assumes that the hazard rate for any individual is proportional to the hazard rate for another individual, given their covariate values.

Jatkoanalyysin can be used to answer questions such as "What is the average time until an event occurs?" or "How do different factors affect the time until an event occurs?" It is a powerful tool in fields such as medicine, engineering, and social sciences, where understanding the timing of events is crucial.