Pareto charts help you identify the most important dimension
in a large set of dimensions. Columns show data in descending order. A line shows cumulative
Pareto charts contain both bar and line graphs. The bars display the data in descending order
from left to right, and the line graph shows the cumulative totals from each category in the same
order. The left Y axis is the record count, and the right Y axis is the cumulative percentage of
the total number of records evaluated. The blue line at the 80% mark helps determine which data
is the most influential in the process. The data to the left of the intersection of the line
graph and the 80% mark have the greatest effect on the overall outcome.
The figure below shows that five callers account for 80% of the incident calls, while seven
account for the other 20%.