Logical Decisions - Classweb
Logical Decisions - Classweb Logical Decisions - Classweb
select the tradeoff you would like to modify. In some situations, it is possible to replace the selected tradeoff with the new tradeoff just assessed. If it is possible, LDW asks you if you would like to replace the old tradeoff with the new. If you retain the old tradeoff, there are several ways LDW can make the adjustments. The simplest way is to adjust the original tradeoff and make no changes to the other tradeoffs. This has the desired result of making the new tradeoff hold, but may have side effects of changing the relative weights of other measures. More complex adjustments are possible, which preserve as many of the original weights as possible while still making the consistency tradeoff hold. Thus, when you get to this stage of the consistency check, LDW shows you the picture in Figure 7-17. In this figure, the measures have been grouped according to those whose relative weights must be adjusted simultaneously. The circles in this figure represent the relative weights of the measures in the different sets. The lines connecting the circles represent one or more tradeoffs. In particular, the line connecting sets B and C represents the single tradeoff being adjusted. The two consistency check measures will be in sets B and C respectively. LDW gives you three options for adjusting these sets. ! Adjust Weights for All Sets. The tradeoff being adjusted is represented in the figure by the line connecting set B to set C. If only this tradeoff is changed, the weights of sets A and B will change in relation to sets C and D, but the relative weights of sets A and B and of sets C and D will not change. In terms of the picture, the size of the circles for sets A and B will become proportionally larger or smaller in relation to the circles for sets C and D. ! Adjust Weights for Set B Only. In this option LDW holds the relative weights of sets A, C and D constant, while it changes the relative weight of set B. To do this, LDW must adjust the tradeoff(s) connecting sets A and B and the tradeoff connecting sets B and C. In terms of the figure, the relative size of the circles for sets A, C and D will remain constant, while the circle for set B will get larger or smaller. 7-46 Section 7 -- Using LDW 2: Assessing
! Adjust Weights for Set C Only. This option is like the previous option, except that set C is the one that changes relative to the others. ! Cancel. This option aborts the consistency check process without making any changes. Figure 7-17. Options for consistency check adjustments. When you select an option, the program begins adjusting tradeoffs. For each tradeoff that LDW modifies, it shows you a screen displaying the original tradeoff and the proposed adjustment. You can accept or reject any of the proposed adjustments. When the adjustments have been completed, LDW shows you a graph with the effects of the adjustments, like that in Figure 7-18. There, the "Adjust Weights for Set B Only" option has been selected, and the circle for Set B has gotten larger while the circles for the other three sets have gotten proportionally smaller. Section 7 -- Using LDW 2: Assessing 7-47
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- Page 150 and 151: Figure 7-13. Example of Direct Entr
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! Adjust Weights for Set C Only. This option is like the<br />
previous option, except that set C is the one that<br />
changes relative to the others.<br />
! Cancel. This option aborts the consistency check<br />
process without making any changes.<br />
Figure 7-17. Options for consistency check adjustments.<br />
When you select an option, the program begins adjusting<br />
tradeoffs. For each tradeoff that LDW modifies, it shows you a<br />
screen displaying the original tradeoff and the proposed<br />
adjustment. You can accept or reject any of the proposed<br />
adjustments. When the adjustments have been completed, LDW<br />
shows you a graph with the effects of the adjustments, like that<br />
in Figure 7-18. There, the "Adjust Weights for Set B Only" option<br />
has been selected, and the circle for Set B has gotten larger while<br />
the circles for the other three sets have gotten proportionally<br />
smaller.<br />
Section 7 -- Using LDW 2: Assessing 7-47
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