Geschikte mappings

Onjuiste aesthetic mappings zorgen voor verwarring of misleiden het publiek.

Meestal zet je de afhankelijke variabele op de y-as en de onafhankelijke variabele op de x-as.

In de gegevensset ToothGrowth hebben we drie variabelen:

Variabele	Beschrijving
`len`	Tandlengte
`supp`	Type supplement (VC of OJ)
`dose`	Dosis in milligram/dag

Van de zes mogelijke manieren om drie variabelen te mappen, staat in de viewer één oplossing. Welke van de onderstaande opties levert de getoonde visualisatie op?

Deze oefening maakt deel uit van de cursus

Introductie tot datavisualisatie met ggplot2

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Praktische interactieve oefening

Zet theorie om in actie met een van onze interactieve oefeningen.

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Deze oefening maakt deel uit van de cursus

Introductie tot datavisualisatie met ggplot2

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4.8+

Begin de cursus gratis

In this chapter we’ll get you into the right frame of mind for developing meaningful visualizations with R. You’ll understand that as a communications tool, visualizations require you to think about your audience first. You’ll also be introduced to the basics of ggplot2 - the 7 different grammatical elements (layers) and aesthetic mappings.

Exercise 1: Introduction Exercise 2: Explore and explain Exercise 3: Drawing your first plot Exercise 4: Data columns types affect plot types Exercise 5: The grammar of graphics Exercise 6: Mapping data columns to aesthetics Exercise 7: Understanding variables Exercise 8: ggplot2 layers Exercise 9: Adding geometries Exercise 10: Changing one geom or every geom Exercise 11: Saving plots as variables

Aesthetic mappings are the cornerstone of the grammar of graphics plotting concept. This is where the magic happens - converting continuous and categorical data into visual scales that provide access to a large amount of information in a very short time. In this chapter you’ll understand how to choose the best aesthetic mappings for your data.

Exercise 1: Zichtbare aesthetics Exercise 2: Alles over aesthetics: kleur, vorm en grootte Exercise 3: Alles over aesthetics: color vs. fill Exercise 4: Alles over aesthetics: aesthetics vergelijken Exercise 5: Aesthetics voor categorische en continue variabelen Exercise 6: Attributen gebruiken Exercise 7: Alles over attributen: color, shape, size en alpha Exercise 8: Alles over attributen: conflicten met aesthetics Exercise 9: Alles uit de kast Exercise 10: Aesthetics aanpassen Exercise 11: Labels voor aesthetics bijwerken Exercise 12: Een dummy-esthetiek instellen Exercise 13: Best practices voor aesthetics Exercise 14: Geschikte mappings

Huidige oefening

A plot’s geometry dictates what visual elements will be used. In this chapter, we’ll familiarize you with the geometries used in the three most common plot types you’ll encounter - scatter plots, bar charts and line plots. We’ll look at a variety of different ways to construct these plots.

Exercise 1: Scatter plots Exercise 2: Overplotting 1: large datasets Exercise 3: Overplotting 2: Aligned values Exercise 4: Overplotting 3: Low-precision data Exercise 5: Overplotting 4: Integer data Exercise 6: Histograms Exercise 7: Drawing histograms Exercise 8: Positions in histograms Exercise 9: Bar plots Exercise 10: Position in bar and col plots Exercise 11: Overlapping bar plots Exercise 12: Bar plots: sequential color palette Exercise 13: Line plots Exercise 14: Basic line plots Exercise 15: Multiple time series

In this chapter, we’ll explore how understanding the structure of your data makes data visualization much easier. Plus, it’s time to make our plots pretty. This is the last step in the data viz process. The Themes layer will enable you to make publication quality plots directly in R. In the next course we'll look at some extra layers to add more variables to your plots.

Exercise 1: Themes from scratch Exercise 2: Moving the legend Exercise 3: Modifying theme elements Exercise 4: Modifying whitespace Exercise 5: Theme flexibility Exercise 6: Built-in themes Exercise 7: Exploring ggthemes Exercise 8: Setting themes Exercise 9: Publication-quality plots Exercise 10: Effective explanatory plots Exercise 11: Using geoms for explanatory plots Exercise 12: Using annotate() for embellishments