nyu politics data lab workshop: data visualization with r ... · why r? mature, widely used,...
TRANSCRIPT
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NYU Politics Data Lab Workshop:Data Visualization with R and ggplot2
Pablo Barberá
Department of PoliticsNew York University
email: [email protected]: @p barbera
October 15, 2013
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Introduction Grammar of graphics Scales, axes, legends Applications Beyond ggplot2
Data Visualization with R and ggplot2
Purpose of workshop: to introduce tools to generate elegant andeffective plots for our academic research.Why R?
Mature, widely used, open-source, easily extensible (5Kpackages on CRAN repository)
Object-oriented programming language.
Many built-in basic and advanced statistical tools.
Why ggplot2?
Based on “Grammar of Graphics” (Wilkinson, 2005)
→ powerful, consistent, modular.Sensible defaults, but also easy to customize
Excellent online resources (and easy to google)
Pablo Barberá Data Visualization with R and ggplot2 October 15, 2013 2/97
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Introduction Grammar of graphics Scales, axes, legends Applications Beyond ggplot2
Outline
1 Mastering the grammar of graphics
Building up a plot layer by layerScales, axes, legendsThemes and other options
2 Applications
Annotated line plotsRegression coefficient plotsNetwork visualizationMaps and spatial analysisAnimated plots
3 Beyond ggplot2
Pablo Barberá Data Visualization with R and ggplot2 October 15, 2013 3/97
-
Introduction Grammar of graphics Scales, axes, legends Applications Beyond ggplot2
Unemployment Rate in the United States, 1948–2013Tr
uman
Eis
enho
wer
Ken
nedy
John
son
Nix
on
For
d
Car
ter
Rea
gan
Bus
h I
Clin
ton
Bus
h II
Oba
ma
2%
4%
6%
8%
10%
1950 1960 1970 1980 1990 2000 2010
Une
mpl
oym
ent R
ate
Party of President Democratic Republican
Pablo Barberá Data Visualization with R and ggplot2 October 15, 2013 4/97
-
Introduction Grammar of graphics Scales, axes, legends Applications Beyond ggplot2
What makes Facebook posts about politics popular?
Format
Content
Language
Time
AuthorAuthor is male
Author is page
Posted in morning
Posted in afternoon
Posted in evening
Post in English
Mentions "boehner"
Mentions "furlough*"
Mentions "obamacare"
Post is a photo
Post is a status update
Post is a video
−25% 0% 25% 50%% increase in popularity metric
Effect on...
likes count
comments count
shares count
Data: 65K public Facebook posts about govt. shutdown
Pablo Barberá Data Visualization with R and ggplot2 October 15, 2013 4/97
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Introduction Grammar of graphics Scales, axes, legends Applications Beyond ggplot2
Visualizing your Facebook network
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NYUEUIUPFMACaixaNYCOthers
Pablo Barberá Data Visualization with R and ggplot2 October 15, 2013 4/97
-
Introduction Grammar of graphics Scales, axes, legends Applications Beyond ggplot2
Geolocated tweets, colored by language
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