To summarise one variable, these graphs can be used:
- For one quantitative variable: Histogram; stem-and-leaf; dot chart.
- For one qualitative variable: Bar chart; pie chart; dot chart.
For two variables, the graphs shown in Table 12.6 can be used. In general, the ‘response’ variable is on the vertical axis.
|Explanatory: Qualitative||Explanatory: Quantitative|
|Response: Qualitative||Stacked bar chart; side-by-side bar chart||Boxplot; back-to-back stem; 2-D dot chart|
|Response: Quantitative||Boxplot; back-to-back stem; s2-D dot chart||Scatterplot|
The following short video may help explain some of these concepts: