Correlations

• Correlation

  Determining the extent of an association between two variables. The co-variables may not be linked at all (zero correlation) or may both increase together (positive correlation), or as one variable increases the other decreases (negative correlation).
• Correlation coefficient

  A number between -1 and +1 which describes the strength of the association between two co-variables in a correlational analysis.
• Correlation coefficient

  A number between -1 and +1 that tells us how closely the co-variables in a correlational analysis are related.
• Co-variables


  The two measured variables in a correlational analysis. They must be continuous.
• Curvilinear correlation


  A non-linear relationship between co-variables, that does not fall on a straight line.
• Linear correlation

  A systematic relationship between co-variables that fits a straight line.
• Scattergram


  A graphical representation of the association (i.e. the correlation) between two sets of scores.