The word regression is a noun. It cannot be an adjective. When it is paired with another noun, it is a noun adjunct.
Examples:
"In statistics, regression analysis refers to techniques for modeling and analyzing several variables"
"Regression techniques are used by psychologists."
of, pertaining to, or determined by regression analysis: regression curve; regression equation. dictionary.com
Regression testing is something every programmer should do after changing the code. Elderly individuals sometimes undergo a remarkable regression to a childlike state. The military's observers reported the regression of the country to a feudal state.
Both. It just matters how you use it in the sentence.
My dictionary said plus is a noun, an adjective, a preposition and a conjunction but not a verb.
Prodigious is not a verb, it is an adjective. You can tell just by looking at him that his ego is prodigious.
Her regression is smoking.
The adjective is regressive (regressing) from the verb to regress. The other adjective form is regressed (experienced regression).
of, pertaining to, or determined by regression analysis: regression curve; regression equation. dictionary.com
i know the facts. What is the reason? For your Regression?
Regression testing is something every programmer should do after changing the code. Elderly individuals sometimes undergo a remarkable regression to a childlike state. The military's observers reported the regression of the country to a feudal state.
by adjective in the sentence
The plant began its regression when the rain stopped falling.
In a sentence.
NO but in the sentence "Use of the word "in" as an adjective is IN these days" the IN is an adjective
An adjective describes a noun.
'He was a worried boy.' In this sentence worried is describing the boy, therefore worried is an adjective.
no