regresyjnym
Regresyjny is a Polish adjective meaning related to regression. The form regresyjnym is the instrumental singular masculine (and neuter) form of this adjective, used to describe a noun in the instrumental case, for example in phrases such as modelem regresyjnym or zestawem regresyjnym.
In practical use, regresyjny commonly appears in technical and scientific contexts to characterize methods, models, or
Etymology and scope: the word regresyjny derives from regresja, itself from Latin regressio meaning a return