Logical Decisions - Classweb
Logical Decisions - Classweb Logical Decisions - Classweb
After you press Enter, LDW will display the utility for that level in the edit box labeled "Utility:". To compute the level that would result in a particular utility, just enter a utility in the edit box labeled "Utility:". After you press Enter, LDW displays the level that would result in that utility in the edit box labeled "Level:". Graphs of Single Tradeoffs The Review::Single Tradeoffs option duplicates the tradeoff assessment screen in the Assess::Weights option in a form that lets you print, or copy it to the clipboard. LDW lets you select any pair of measures or goals to display. If you select a pair of measures that were not assessed directly in a tradeoff, LDW will compute a tradeoff for the pair. LDW will indicate this by printing "Tradeoff computed by Logical Decisions" at the bottom of the tradeoff window. When you select the option, LDW shows you a dialog box with two lists of the currently defined measures and goals. Just select one member from each list and LDW will compute and display a tradeoff for the pair. An example is shown in Figure 8-3. Figure 8-3. Example of Review::Single Tradeoffs option. 8-4 Section 8 -- Using LDW 3: Reviewing Results
The tradeoff graph has one measure (or goal) on the horizontal axis and one on the vertical axis. You can think of any point in this rectangle as a simplified alternative that has the indicated levels on the two measures and a nominal level on all of the other measures. For example, a point in the upper left corner of the rectangle represents a truck alternative with a price of $15,000 and 175 horsepower. A point in the lower right corner represents a truck alternative with a price of $23,000 and 109 horsepower. A point in the very center of the rectangle would represent a truck alternative with a price of $18,500 and 142 horsepower. LDW marks actual alternatives with small crosses showing their levels on the two measures. The points labeled "A" and "B" on the graph represent a pair of simplified alternatives that you should prefer equally. Thus, above, you should prefer a truck alternative with a price of $15,000 and 109 horsepower and one with a price of $20,000 and 175 horsepower equally. The line connecting the A and B points represents a set of potential price/horsepower combinations that you should prefer equally to A and B. LDW computes this line based on the single measure utility functions for the price and horsepower measures. The line at the bottom of the display shows the relative weights of the two measures. The relative weights are those necessary to allow points A and B to have the same overall utility given the ranges of the two measures and their single measure utility functions. In the display above, the price measure will have about sixty percent more weight than the horsepower measure. The absolute weights of these two measures will depend on the number of other measures in the analysis and their relative weights based on other tradeoffs. You can view the tradeoff relationships for all the measures with the Review::Tradeoff Summary Graph option. Tradeoffs by One Measure The Review::Tradeoffs by One Measure option lets you review the relative importance of the various measures by computing tradeoffs for all of them against one selected measure. For example, you could select this option to see how each of the measures in your analysis would be traded against price, even if another weight assessment method were used or not all tradeoffs Section 8 -- Using LDW 3: Reviewing Results 8-5
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The tradeoff graph has one measure (or goal) on the horizontal<br />
axis and one on the vertical axis. You can think of any point in<br />
this rectangle as a simplified alternative that has the indicated<br />
levels on the two measures and a nominal level on all of the other<br />
measures.<br />
For example, a point in the upper left corner of the rectangle<br />
represents a truck alternative with a price of $15,000 and 175<br />
horsepower. A point in the lower right corner represents a truck<br />
alternative with a price of $23,000 and 109 horsepower. A point in<br />
the very center of the rectangle would represent a truck<br />
alternative with a price of $18,500 and 142 horsepower. LDW<br />
marks actual alternatives with small crosses showing their levels<br />
on the two measures.<br />
The points labeled "A" and "B" on the graph represent a pair of<br />
simplified alternatives that you should prefer equally. Thus,<br />
above, you should prefer a truck alternative with a price of<br />
$15,000 and 109 horsepower and one with a price of $20,000 and<br />
175 horsepower equally. The line connecting the A and B points<br />
represents a set of potential price/horsepower combinations that<br />
you should prefer equally to A and B. LDW computes this line<br />
based on the single measure utility functions for the price and<br />
horsepower measures.<br />
The line at the bottom of the display shows the relative weights of<br />
the two measures. The relative weights are those necessary to<br />
allow points A and B to have the same overall utility given the<br />
ranges of the two measures and their single measure utility<br />
functions. In the display above, the price measure will have about<br />
sixty percent more weight than the horsepower measure. The<br />
absolute weights of these two measures will depend on the<br />
number of other measures in the analysis and their relative<br />
weights based on other tradeoffs. You can view the tradeoff<br />
relationships for all the measures with the Review::Tradeoff<br />
Summary Graph option.<br />
Tradeoffs by One Measure<br />
The Review::Tradeoffs by One Measure option lets you review the<br />
relative importance of the various measures by computing<br />
tradeoffs for all of them against one selected measure. For<br />
example, you could select this option to see how each of the<br />
measures in your analysis would be traded against price, even if<br />
another weight assessment method were used or not all tradeoffs<br />
Section 8 -- Using LDW 3: Reviewing Results 8-5
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