Logical Decisions - Classweb
Logical Decisions - Classweb Logical Decisions - Classweb
In the window, the upper pane shows the current overall utilities for the alternatives. The lower pane shows the weights for the goals and measures. (The weights are adjusted to sum to 1.0 if there are interactions). Goals are shown in green at the top of the pane, and measures are shown in blue below the goals. You can temporarily adjust the weight for a measure or goal in the lower pane and see the effect on the alternatives' utilities in the upper pane. You adjust a weight for a measure or goal by changing the length of its bar. To change a bar's length, you drag its right hand edge. When finish dragging, LDW will redraw the bar and the weight for the member will be updated based on the bar’s proportional length. You can also directly enter a new weight by clicking on the current weight. An edit bor where you can enter the new weight will appear. After you adjust a weight, the weights for the other goals and measures will be increased or decreased to ensure that the weights sum to 1.0. LDW will then use these adjusted weights to recalculate the overall utilities for the alternatives. The upper pane will be adjusted to reflect the new utilities. The changes you make in the dynamic sensitivity graph are only temporary. When you close the window the weights and alternative utilities will revert to what they were before. Dynamic Sensitivity Options. The Sensitivity menu appears when you select the Results::Dynamic Sensitivity option. It has two options. The Sensitivity::Restore Weights option restores all of the weights (and bars) to the values they had when you first created the window. The Sensitivity::Save Weights option saves the current weights in a new preference set called “Sensitivity.” The other information, such as the single measure utility functions (SUFs), is copied from the active preference set with no change. 8-28 Section 8 -- Using LDW 3: Reviewing Results
Sensitivity Graphs Sensitivity graphs let you display the effect of varying a measure or goal's weight from 0 to 100 percent. You can view a sensitivity graph by selecting the Results::Sensitivity Graph option. When you select the option, LDW shows you the dialog box shown in Figure 8-23. Figure 8-24. Dialog Box for Results::Sensitivity Graph option. At the left of the dialog box is a list of the goals and measures in the analysis. Select the member that will appear in the horizontal axis of the group from this list. The "Number of Bars" line at the upper right of the dialog box determines how many alternatives LDW should draw. LDW will draw the alternatives with the highest overall utilities. The buttons at the right of the dialog box tell LDW how to draw the key at the left of the sensitivity graph. The "Local Rank" button tells LDW to sort the alternative lines by their ranking on the selected measure. This will make them correspond to their order at the right of the graph. The "Overall Rank" button tells LDW to sort the alternative lines by their overall ranking. This will make them correspond to their order at the vertical line in the center of the graph. The “Name” button tells LDW to sort the alternatives by name. After you click "OK," LDW creates a graph like the one in Figure 8-25. Section 8 -- Using LDW 3: Reviewing Results 8-29
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Sensitivity Graphs<br />
Sensitivity graphs let you display the effect of varying a measure<br />
or goal's weight from 0 to 100 percent.<br />
You can view a sensitivity graph by selecting the<br />
Results::Sensitivity Graph option. When you select the option,<br />
LDW shows you the dialog box shown in Figure 8-23.<br />
Figure 8-24. Dialog Box for Results::Sensitivity Graph option.<br />
At the left of the dialog box is a list of the goals and measures in<br />
the analysis. Select the member that will appear in the horizontal<br />
axis of the group from this list.<br />
The "Number of Bars" line at the upper right of the dialog box<br />
determines how many alternatives LDW should draw. LDW will<br />
draw the alternatives with the highest overall utilities.<br />
The buttons at the right of the dialog box tell LDW how to draw<br />
the key at the left of the sensitivity graph. The "Local Rank"<br />
button tells LDW to sort the alternative lines by their ranking on<br />
the selected measure. This will make them correspond to their<br />
order at the right of the graph. The "Overall Rank" button tells<br />
LDW to sort the alternative lines by their overall ranking. This<br />
will make them correspond to their order at the vertical line in the<br />
center of the graph. The “Name” button tells LDW to sort the<br />
alternatives by name.<br />
After you click "OK," LDW creates a graph like the one in Figure<br />
8-25.<br />
Section 8 -- Using LDW 3: Reviewing Results 8-29
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