Paluuaika
Paluuaika is a statistical concept used especially in hydrology, meteorology and risk assessment to describe the recurrence interval or return time of a specified extreme event. It expresses, on average, how often an event of a given magnitude or larger is expected to occur under a chosen statistical model.
Calculation relies on a probabilistic framework. In a simple Poisson model with rate lambda of events per
Important caveats include that paluuaika is an average over many realizations, not a guaranteed schedule. Real-world
Applications include civil engineering, flood risk assessment, dam and bridge design, insurance, and land-use planning. Paluuaika
See also: Recurrence interval; Return period; Extreme value theory; Exceedance probability.