Involving or depending on two variables; relating to data or systems with two changing quantities.
From Latin 'bi-' (two) + 'variate' (a statistical term from 'variare'). Became a standard statistics term in the 20th century for analyzing relationships between two variables.
Scatter plots showing how height and weight relate are bivariate data—each person provides two pieces of information. Understanding bivariate relationships helps doctors spot that taller people tend to weigh more, but it doesn't mean one causes the other!
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