Attribution

The following slides are based on

• Fundamentals of Data Visualization (link)
  and are following the
• Attribution-NonCommercial-NoDerivatives 4.0 International License (link)

Association of two quantitative Variables

Scatter Plot

Here headlength and wight of birds

The heavier the bird, the longer the head, roughly

Additional visual clue via color: sex

Further information via dot size: skull size

Pairwise Association of many quantitative variables

Matrix of Scatter Plots

Correlation

Correlation coefficient

+/-0.2: weak

+/-0.6: medium

+/-0.9: strong

Heatmap, actually, correlogram due to symmetry

Here mineral content of glass fragments

Magnesium negatively correlated with nearly all others

Aluminum positively correlated with barium

Association of few Data Points

Slopegraph

Two measurements

Three measurements