Epästationaarisesti

Epästationaarisesti is a Finnish adverb that translates to "non-stationarily" or "unstably" in English. It describes a state or process that is not constant over time, meaning its properties or behavior change. In scientific contexts, particularly in physics and mathematics, the term "non-stationary" refers to systems or processes whose statistical properties, such as mean, variance, or autocorrelation, change over time. This contrasts with stationary processes, where these properties remain constant. For example, a time series of stock prices might be considered non-stationary because the average price and its fluctuations can vary significantly from day to day or over longer periods.

In a broader sense, "epästationaarisesti" can be used in everyday language to describe anything that is not behaving in a predictable or consistent manner. This could apply to weather patterns that change rapidly, a person's mood that fluctuates, or a system that is undergoing continuous development or decay. The opposite of epästationaarisesti is "stationaarisesti," meaning "stationarily" or "stably," which describes a state of constancy or equilibrium. Understanding whether a system is behaving epästationaarisesti or stationaarisesti is crucial for accurate modeling, prediction, and control in various fields.