Questions, Methods and Choices
Edited by Catherine Walshe and Sarah Brearley
Chapter 13: Analysing quantitative data: correlation and beyond
The goal of this chapter is to introduce you to the concept of correlation, and extends to part/partial correlation, big R2 and variance decomposition. Correlation and regression are the most widely used methods in the sciences. They summarize the size and direction of the association between variables. As we work our way manipulating these concepts with applied examples – learning by doing – I also frame the presentation as a mean of providing resources to operationalize research problems. All analyses are conducted using the free statistical program R, and examples are based on real data about the association of child depression and family history of mental health in children and adolescents.
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