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What is chi-square? An example looking at Brexit

Written by Professor Richard Harris, Geographical Sciences, University of Bristol

  • Key Stage Three,
  • Key Stage Four,
  • Key Stage Five,
  • Global perspectives, geopolitics and development,
  • Urbanisation, migration and society,
  • Data Skills

Introduction

Chi-square has been described by the statistician Michael Crawley as something taught to geographers at school and misunderstood thereafter! It’s a mischievous comment and a shame if true because despite its off-putting calculations there is nothing particularly complicated about chi-square.

It’s just a way of asking if two ‘things’ are related to one another or not, and assessing the statistical evidence for it.

This tutorial:

  • Shows how to fit a chi-square test to some data looking at the results of the referendum on leaving the EU

  • Discusses how the chi-square test works - what it is actually doing and why

  • Notes that the chi-square test is often not that useful and that there are often simpler approaches that can be better used instead

Read more

 

This project was funded by the Nuffield Foundation, but the views expressed are those of the authors and not necessarily those of the Foundation

 

 

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