Mittejuhuslikud

Mittejuhuslikud is Estonian an adjective meaning “not random” or “deterministic.” It is formed from the prefix mitte- meaning “not” and the root juhuslik meaning “random.” The term is used in science, mathematics, statistics and related fields to describe processes, models or data that are governed by fixed rules and yield the same result under the same conditions, in contrast to random or stochastic phenomena.

In mathematics and computer science, mittejuhuslikud models produce deterministic outcomes: given a specific input, the procedure or equation yields a uniquely determined output. Examples include deterministic algorithms, most classical physical models under ideal conditions, and many statistical models that assume fixed parameters without random variation.

In practice, few real-world systems are perfectly non-random. Noise, measurement errors, and uncontrollable external factors often introduce randomness, making mittejuhuslikud approximations a useful simplification rather than an exact description. Researchers may test robustness by comparing to random or stochastic models.

The term is commonly used with nouns describing data, processes or methods, such as mittejuhuslikud valikud (non-random choices) or mittejuhuslikud järjestused, and is contrasted with juhuslikkuse or stohastiline. In Estonian scholarly writing, a clear distinction between non-random and random components helps specify assumptions and model behavior.