In statistics, a relationship between two variables is negative if the slope in a corresponding graph is negative, or—what is in some contexts equivalent—if the correlation between them is negative. Negative correlation is also variously called anticorrelation, inverse correlation, or inverse relationship.
"They observed a negative relationship between illness and vaccination."
As incident of vaccination is increasing, incidence of illness is decreasing, and vice versa.
Compare to a positive relationship: Observed a positive relationship between illness and missed work.
As incidence of illness increased, sick days taken also increased.
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