Graph for Qualitative (Nominal) Data

Graph for Qualitative (Nominal) Data

• There are a couple of graphs that are appropriate for qualitative data that has no natural ordering.

1. Bar graphs

• Bar Graphs are like histograms, but the horizontal axis has the name of each category and there are spaces between the bars.

• Usually, the bars are ordered with the categories in alphabetical order. One variant of a bar graph is called a Pareto Chart. These are bar graphs with the categories ordered by frequency, from largest to smallest.

• Fig. 2.5.1 shows bar graph.

• Bars of a bar graph can be represented both vertically and horizontally.

• In bar graph, bars are used to represent the amount of data in each category; one axis displays the categories of qualitative data and the other axis displays the frequencies.