Types

When to Use what

see: quantitative and qualitative variables

VariablesPlotNumerical Summary Format
1 QualitativeSimple Barplot
simple bar plot.png
frequency table

Most popular category
2 QualitativeDouble barplotdouble bar plot.pngcontingency table

Most popular category
1 Quantitativehistogram & boxplot
simple histogram.png
simple box plot.png
Mean, median, SD, IQR, range
2 QuantitativeSimple scatterplot
simple scatterplot.png
correlation coefficient

Linear model
1 Qualitative + 1 QuantitativeComparative boxplot & strip plot & Filtered histogramcomparative boxplot.jpeg

filtered histogram.jpeg
2 Quantitative+Filtered scatterplot
filtered scatterplot.jpeg

Further Reading