correlation is when increases in one variable are accompanied by decreases in another variable. Negative correlation refers to a statistical relationship in which increases in one measure are matched by decreases in the other; association between two variables in which one increases as the other decreases.
word or sentence, is inappropriate or unacceptable. All the sentences that children hear are positive evidence of possible constructions in the language . Negative evidence would be feedback or correction when the child produces an ungrammatical sentence. The availability of negative evidence in children's input is a matter of some controversy.