The sample data table On-Time Arrivals.jmp reflects the percent of on-time arrivals for several airlines. The data was collected for March, June, and August of 1999.
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2.
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Right-click the column heading of the new column and select Formula. The Formula Editor window appears.
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Figure 1.22 Formula Editor
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3.
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From the Columns list, select March 1999.
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4.
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Click the
 button on the keypad. |
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5.
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6.
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Select August 1999.
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Figure 1.23 Sum of the Months
Figure 1.24 Entire Formula Selected
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9.
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Figure 1.25 Completed Formula
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10.
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Click OK
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The Formula Editor has many built-in arithmetic and statistical functions. For example, another way to calculate the average on-time arrival percentage is to use the Mean function in the Statistical functions list. For details about all of the Formula Editor functions, see Formula Editor in the Using JMP book.