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Know your problem
Know your data
Visualise your data
11. Step 4 - draw your chart
Work with your chart
Check yourself


In the previous exercises, we prepared data for our bar chart. Let's see again how data can be represented in a bar chart.

Example of data

The above image shows how particular values from our frequency table are displayed in the chart. The highlighted row in the frequency table gives us the name of the pattern value ("medium risky"), which also appears on the horizontal axis. The frequency table shows the frequency of "medium risky" in the data set (109), which the bar chart shows by the length of the bar and (approximately, by position) on the vertical axis.

Always start the numerical axis at zero when drawing a bar chart! Otherwise, your representations may not be accurate. Remember, the length or height of the bar tells us the numerical value of that category variable. Never "truncate" a bar chart's numerical axis by starting above zero. It should always start at zero, otherwise we can't properly read chart values.