Runway
18L
17R
36R
35L
Count
1,730
2,155
1,475
1,652
Maximum
2,616
2,597
3,004
2,649
Minimum
323
365
456
357
Mean
1,199
1,258
1,371
1,341
Standard Deviation
277
294
285
318
Average Variation
213
223
220
250
Median
1,180
1,234
1,363
1,333
South Flow
North Flow
The sample dataset, which is described in the introduction, has 1340 arrivals on runway 18R is
plotted in Figure 3 with the mean, upper control limit (UCL) and lower control limit (LCL) super
imposed on the chart.
UCL =
x + 3s where x = mean and s = standard deviation, and LCL = x – 3s
The control limits help to identify the outliers in the datasets. The critical characteristic of all
eight datasets is that there are no outliers on the lower end of their distributions. More than 99%
of the data points can be found within the control limit thresholds as one would expect for a
nearly normal distribution.
Satyamurti and Mattingly
6
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