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correlation > define

noun

  • A reciprocal relation between two or more things.
  • A statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation. to +1 (perfect positive correlation))
    • usage: "what is the correlation between those two variables"
  • A statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other.
by WordNet 3.0 © 2006 by Princeton University
(n.) Reciprocal relation; corresponding similarity or parallelism of relation or law; capacity of being converted into or of giving place to, one another, under certain conditions; as, the correlation of forces or of zymotic diseases.
by Webster's Revised Unabridged Dictionary

correlation is the degree of relationship between two sets of data. A correlation near plus 1, called a positive correlation, indicates that changes in one set of data are closely related to changes in the other set and that the data sets change in the same direction. A correlation near minus 1, called negative correlation, indicates that changes in one set of data are closely related to changes in the other set and that the data sets change in the opposite direction. A correlation near zero indicates little or no relationship between the changes in the two sets of data.