Vrstvy ggplot2

Úvod do vizualizace dat s ggplot2

Rick Scavetta

Founder, Scavetta Academy

Balíček ggplot2

Gramatika grafiky implementovaná v R
Dva klíčové koncepty:
1. Gramatické prvky vrstev
2. Estetická mapování

Data

Datová sada iris

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.

Datová sada iris

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

Estetiky

Estetiky datové sady iris

Geometrie

Geometrie datové sady iris

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

Témata

Témata datové sady iris

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

Pojďme si procvičit!

Úvod do vizualizace dat s ggplot2