Logical Decisions - Classweb
Logical Decisions - Classweb Logical Decisions - Classweb
clicking on the "Initialize" button. LDW will ask you to confirm before it initializes the interactions. The status line above the interaction assessment method tells you how much of the assessment you have completed. A status of "Defaults Used" shows that you haven't done any interactions assessments for the active goal or that you have initialized the interactions for the goal. A status of "Assessment Complete" shows that you have completed all of the needed assessments for the selected method. You can still go back and review or make changes by clicking the "Assess" button even if the status says "Assessment Complete." No Interactions. The "No Interactions" method forces the active goal's MUF to be the weighted sum of the utilities of the active members. An Additional Tradeoff. The "Additional Tradeoff" method lets you define the MUF formula by assessing a second tradeoff for two active members. You begin this method by selecting it and clicking the "Assess" button. When you do this, LDW asks you to select two of the active members to use in the second tradeoff. If you are using the "tradeoff" or "pairwise weight ratios" weight assessment method LDW shows you a list of the tradeoffs for the active goal. LDW then shows you a tradeoff assessment screen like the one in the "tradeoff" weight assessment method described on page 7- 26. Typically, the second tradeoff will include one hypothetical alternative with levels at the extremes of the measures' ranges and one with levels in the middle of the measures' ranges. LDW will let you move both members as in the Tradeoff::Allow Free Float option to do this. For example, suppose measures m1 and m2 both range from 0 to 1 with straight line SUFs and an initial tradeoff of (m1 = 0, m2 = 1) equally preferred to (m1 = 1 and m2 = 0) that implies the measures have equal weights. If a second tradeoff of (m1 = 0, m2 = 1) equally preferred to (m1 = .5 and m2 = .5) 7-42 Section 7 -- Using LDW 2: Assessing
is defined, an additive MUF formula is implied. If a second tradeoff of (m1 = 0, m2 = 1) equally preferred to (m1 = .3 and m2 = .3) is defined, destructive interaction, where a low utility on one measure leads to a low overall utility, is implied. If a second tradeoff of (m1 = 0, m2 = 1) equally preferred to (m1 = .7 and m2 = .7) is defined, constructive interaction, where a high utility on one measure leads to a high overall utility, is implied. Probability Method. The "Probability" method lets you define the MUF Formula for the active goal by answering a probabilistic question about two active members. When you select the method and click the "Assess" button, LDW asks you to select two of the active members to use in the probability method assessment. If you are using the "tradeoff" or "pairwise weight ratios" weight assessment method, LDW shows you a list of the tradeoffs defined for the active goal. Then LDW shows you two simplified alternatives involving the selected members. The first alternative is an equal chance of A) having the first member at its best level and the second member at its worst or B) having the first member at its worst level and the second member at its best. The second alternative is a probability of P of having both members at their best level and a probability (1 - P) of having both members at their worst level. See Figure 9-16 on page 9-61 for an example of these alternatives. LDW asks you to identify the probability P that makes the two alternatives equally preferred. In the first alternative the members compensate for one another. The second is all or nothing. If the two members don't interact strongly, the alternatives should seem the same and P should be 0.5. If the members interact destructively, where a low utility on one member makes an alternative undesirable, P will be between 0.0 and 0.5. If the members interact constructively, where a high utility on only one member is needed to make an alternative desirable, P will be between 0.5 and 1.0. Section 7 -- Using LDW 2: Assessing 7-43
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- Page 112 and 113: Figure 6-17. Dialog box for definin
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- Page 130 and 131: Figure 7-4. Utility Assessment Scre
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- Page 134 and 135: Figure 7-6. Assessment matrix for A
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- Page 148 and 149: The Tradeoff::Use Alternatives to S
- Page 150 and 151: Figure 7-13. Example of Direct Entr
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- Page 169 and 170: Using LDW 3: Reviewing Results Intr
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- Page 191 and 192: Figure 8-18. Dialog box for Results
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is defined, an additive MUF formula is implied. If a second<br />
tradeoff of<br />
(m1 = 0, m2 = 1) equally preferred to (m1 = .3 and m2 = .3)<br />
is defined, destructive interaction, where a low utility on one<br />
measure leads to a low overall utility, is implied. If a second<br />
tradeoff of<br />
(m1 = 0, m2 = 1) equally preferred to (m1 = .7 and m2 = .7)<br />
is defined, constructive interaction, where a high utility on one<br />
measure leads to a high overall utility, is implied.<br />
Probability Method. The "Probability" method lets you define<br />
the MUF Formula for the active goal by answering a<br />
probabilistic question about two active members.<br />
When you select the method and click the "Assess" button, LDW<br />
asks you to select two of the active members to use in the<br />
probability method assessment. If you are using the "tradeoff" or<br />
"pairwise weight ratios" weight assessment method, LDW shows<br />
you a list of the tradeoffs defined for the active goal. Then LDW<br />
shows you two simplified alternatives involving the selected<br />
members. The first alternative is an equal chance of A) having<br />
the first member at its best level and the second member at its<br />
worst or B) having the first member at its worst level and the<br />
second member at its best.<br />
The second alternative is a probability of P of having both<br />
members at their best level and a probability (1 - P) of having<br />
both members at their worst level. See Figure 9-16 on page 9-61<br />
for an example of these alternatives. LDW asks you to identify<br />
the probability P that makes the two alternatives equally<br />
preferred.<br />
In the first alternative the members compensate for one another.<br />
The second is all or nothing. If the two members don't interact<br />
strongly, the alternatives should seem the same and P should be<br />
0.5. If the members interact destructively, where a low utility on<br />
one member makes an alternative undesirable, P will be between<br />
0.0 and 0.5.<br />
If the members interact constructively, where a high utility on<br />
only one member is needed to make an alternative desirable, P<br />
will be between 0.5 and 1.0.<br />
Section 7 -- Using LDW 2: Assessing 7-43
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