As the values of one variable change, do we see corresponding changes in the other variable? Given such data, we begin by determining if there is a relationship between these two variables. We collect pairs of data and instead of examining each variable separately (univariate data), we want to find ways to describe bivariate data, in which two variables are measured on each subject in our sample. For example, we measure precipitation and plant growth, or number of young with nesting habitat, or soil erosion and volume of water. In many studies, we measure more than one variable for each individual.
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