23.3.2 Ranking Method
The ranking method is similar to the observation method except that the experiments are written in the order of increasing or decreasing responses so that the experiment with the best response is first and the worst response is the last. Now the factor columns are observed to find levels that consistently produce good or bad results. The following example provides further details of this method.
TABLE 23.9 Scheduler Design Study Data Sorted by Word Processing Throughput
|
|
Experiment No.
| A
| B
| C
| D
| E
| TW
| TI
| TB
|
|
7
|
|
| 1
| -1
|
| 28.0
| 36.3
| 20.2
|
11
|
|
| -1
| 1
|
| 27.0
| 34.6
| 15.7
|
15
|
|
| 1
| 1
| -1
| 25.0
| 35.0
| 17.2
|
3
|
|
| -1
| -1
| -1
| 25.0
| 36.0
| 21.0
|
1
|
| -1
| -1
| -1
| 1
| 15.0
| 25.0
| 15.2
|
5
|
| -1
| 1
| -1
| -1
| 14.0
| 63.9
| 7.5
|
9
|
| -1
| -1
| 1
| -1
| 14.0
| 66.1
| 6.4
|
13
|
| -1
| 1
| 1
| 1
| 14.0
| 26.0
| 12.0
|
2
|
| -1
| -1
| -1
| -1
| 11.0
| 41.0
| 3.0
|
8
|
| 1
| 1
| -1
| -1
| 11.0
| 23.0
| 3.0
|
12
|
| 1
| -1
| 1
| -1
| 11.0
| 23.0
| 3.0
|
14
|
| -1
| 1
| 1
| -1
| 11.0
| 38.0
| 2.0
|
16
|
| 1
| 1
| 1
|
| 11.0
| 22.0
| 2.0
|
6
|
| -1
| 1
| -1
|
| 10.0
| 13.2
| 7.5
|
4
|
| 1
|
| -1
|
| 10.0
| 15.7
| 8.6
|
10
|
| -1
|
| 1
|
| 10.0
| 9.1
| 8.4
|
|