#correlational_statistics__correlation  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
  supertype:  statistic  a datum that can be represented numerically
  part of:  correlational_analysis
  subtype:  curvilinear_correlation__curvilinearcorrelation__nonlinear_correlation__skew_correlation  any correlation in which the rates of change of the variables is not constant
  subtype:  partial_correlation__partialcorrelation  a correlation between two variables when the effects of one or more related variables are removed
     subtype:  first-order_correlation__firstordercorrelation  a partial correlation in which the effects of only one variable are removed (held constant)
  subtype:  positive_correlation__direct_correlation  a correlation in which large values of one variable are associated with large values of the other and small with small; the correlation coefficient is between 0 and +1
  subtype:  negative_correlation__indirect_correlation  a correlation in which large values of one variable are associated with small values of the other; the correlation coefficient is between 0 and -1
  subtype:  spurious_correlation  a correlation between two variables (e.g., between the number of electric motors in the home and grades at school) that does not result from any direct relation between them (buying electric motors will not raise grades) but from their relation to other variables

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