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Example 2.12
Exploring Data with Pivot Tables
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OTIS3.XLS
Lists the diameters (in inches) of elevator rails produced by Otis Elevator’s two machines and two operators. Each diameter corresponds to a particular machine/operator combination. A portion of the data is shown on the following slide
What effects, if any, do the operator and machine have on elevator rail diameters?
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Data
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Creating the Pivot Table
We created the pivot table for this example as follows:
– Drag Machine to the row area
– Operator to the column area
– Diameter to the data area - summarize by average
The following is the resulting pivot table and 3-D column chart.
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The Pivot Table and Chart
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Analyzing the Results
The numbers and graph indicate several interesting results.
On average, the diameters on machine 2 are about 0.01 inch larger than those for machine 1.
On average, the diameters for operator 2 are about 0.01 inch larger than those for operator 1.
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Additional Pivot Table Options
Importing data from an external database
We can use a “page” field for added flexibility. This will be explored in the next chapter.
We can drag multiple field to any of he areas. Also, fields can be dragged around without going back to the wizard. The Pivot Table automatically adjusts itself.
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Additional Options -- continued
By double-clicking on any pivot table entry we can see all of the data that were used to computer the entry.
The pivot table retains a link to the original data, so that if the original data change, the pivot table recalculates automatically. To refresh the data, click on the exclamation point on the PivotTable toolbar.
