The final graph we shall look at in this section is the ogive. This is a way of plotting the cumulative frequency of occurrences. The cumulative frequency is like a running total of all events as they occur, and it is often found on a tally chart.
Let's look at an example.
|Colour ran at first wearing||2||2|
|Don't like them||2||4|
|Heel fell off||7||11|
|Odd sizes in a box||4||23|
|Trim fell off||12||38|
|Wrong colour for outfit||3||41|
This information can be represented graphically by means of an ogive (an architectural term for the rib of a vault). Pareto charts, as you will see in the next section, are often completed by adding an ogive showing either the cumulative frequency or the cumulative percentage for the defect categories.