## Exploratory Data Analysis: Quantile-Quantile Plots for New York’s Ozone Pollution Data

September 22, 2013 2 Comments

#### Introduction

Continuing my recent series on exploratory data analysis, today’s post focuses on quantile-quantile (Q-Q) plots, which are very useful plots for assessing how closely a data set fits a particular distribution. I will discuss how Q-Q plots are constructed and use Q-Q plots to assess the distribution of the “Ozone” data from the built-in “airquality” data set in R.

Previous posts in this series on EDA include

- Descriptive statistics
- Box plots
- The conceptual foundations of kernel density estimation
- How to construct kernel density plots and rug plots in R
- Violin plots
- The conceptual foundations of empirical cumulative distribution functions (CDFs)
- 2 ways of plotting empirical CDFs in R
- Conceptual foundations of histograms and how to plot them in R
- Combining histograms and density plots in R
- The 5-number summary: Differences between fivenum() and summary() in R
- Useful R Functions for Exploring a Data Frame

**Learn how to create a quantile-quantile plot like this one with R code in the rest of this blog!**

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