Handbook of Theory and Methods in Applied Health Research
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Handbook of Theory and Methods in Applied Health Research

Questions, Methods and Choices

Edited by Catherine Walshe and Sarah Brearley

This Handbook expertly instructs the reader on how to conduct applied health research across a number of disciplines. Particularly aimed at postgraduate health researchers and students of applied health research, it presents and explains a wide range of research designs and other contemporary issues in applied health research.
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Chapter 13: Analysing quantitative data: correlation and beyond

Guillermo Perez Algorta


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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