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anova_test_r's Introduction

ANOVA test in R

We are going to explore ANOVA to test a hypothesis concerning more than two groups. ANOVA tell us if one group mean is distinct of others but it doesn't know which. We are going to run a ‘post-hoc analysis’.

0. The problem

We are going to use the diamonds dataset from ggplot2 package.

Our hypothesis are:

  • Null Hypothesis: the mean of carat weight of the diamond is equal across all the quality cuts (Fair, Good, Very Good, Premium, Ideal)
  • Alternative hypothesis: The mean carat is distinct in cuts.

1. Import and exploring dataset

Here we are import the dataset and see the three first rows:

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