ggplot2-lagen

Introductie tot datavisualisatie met ggplot2

Rick Scavetta

Founder, Scavetta Academy

ggplot2-pakket

De grammar of graphics geïmplementeerd in R
Twee kernideeën:
1. Lagen met grammaticale elementen
2. Aesthetische mappings

Data

Iris-dataset

¹ Fisher, R. A. (1936) The use of multiple measurements in taxonomic problems. Annals of Eugenics, 7, Part II, 179–188. ² Anderson, Edgar (1935). The irises of the Gaspe Peninsula, Bulletin of the American Iris Society, 59, 2–5.

Iris-dataset

iris

    Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
1            5.1         3.5          1.4         0.2     setosa
2            4.9         3.0          1.4         0.2     setosa
3            4.7         3.2          1.3         0.2     setosa
...
50           5.0         3.3          1.4         0.2     setosa
51           7.0         3.2          4.7         1.4 versicolor
52           6.4         3.2          4.5         1.5 versicolor
53           6.9         3.1          4.9         1.5 versicolor
...
100          5.7         2.8          4.1         1.3 versicolor
101          6.3         3.3          6.0         2.5  virginica
102          5.8         2.7          5.1         1.9  virginica
103          7.1         3.0          5.9         2.1  virginica
...
150          5.9         3.0          5.1         1.8  virginica

Vormgeving (aesthetics)

Iris-aesthetics

Geometrieën

Iris-geometrieën

g <- ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width)) +
  geom_jitter()
g

Thema’s

Iris-thema’s

g <- g +
  labs(x = "Sepal Length (cm)", y = "Sepal Width (cm)") +
  theme_classic()
g

Laten we oefenen!

Introductie tot datavisualisatie met ggplot2