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 phenomena that are based on regression analysis. Examples include model regresyjny, describing a regression-based model, or analizę regresyjną, referring to regression analysis (the latter being a feminine noun phrase in form, but related in meaning). The instrumental form regresyjnym is typically found in constructions like w modelu regresyjnym (in a regression model) or z modelem regresyjnym (with a regression model), where the adjective properly agrees with the noun in case and gender.

Etymology and scope: the word regresyjny derives from regresja, itself from Latin regressio meaning a return or going back, extended in Polish to denote statistical regression as a formal relationship between variables. The term is used across disciplines such as statistics, econometrics, psychology, and data science to describe approaches that model dependent relationships using regression techniques. As a morphological form, regresyjnym serves to link the adjective to masculine or neuter nouns in the instrumental case, reinforcing precise syntactic agreement in Polish sentences.