Logical Decisions - Classweb
Logical Decisions - Classweb Logical Decisions - Classweb
You can change the shape of the curve by moving the active point. You can move the active point in two ways. First, you can drag the active point with your mouse. You can drag the active point anywhere in the rectangle defined by the two endpoints of the active sub-range. LDW will attempt to fit a smooth (exponential) curve through the endpoints of the sub-range and the new active point. It is not always possible to do this if you move the active point near an endpoint. LDW will move the point if necessary to fit smooth curve. LDW shows the new location of the point in the edit boxes at the bottom of the window. You can also move the active point by changing the values in the two edit boxes. The box on the left contains the level for the active point and the box on the right contains its utility. If you enter a new value for either of these numbers, LDW will update the location of the active point in the graph and will draw a new SUF curve through it. You must press Enter to let LDW know when you have finished changing a number in one of these boxes. Splitting a Sub-Range. You can split a sub-range into two parts using the SUF::Split Range option. When you select this option, LDW will split the active sub-range into two sub-ranges at the active point. The active point will become the highest level of one sub-range and the lowest level of the other. LDW will set the SUF curves for the two new sub-ranges to straight lines. Changing the Active Point. Two types of points can be the active point -- points that define the midpoint of a sub-range and points that define an endpoint of a sub-range. When you select the midpoint of a sub-range for the active point, LDW highlights the entire sub-range in green. When you select an endpoint for the active point, LDW highlights just that point in green. You can make a point active by clicking on it with your mouse. Or, you can use the Left and Right-Arrow keys to move the active point between adjacent midpoints and endpoints. Combining Two Sub Ranges. You can combine two sub-ranges using the SUF::Delete Split Point option. Before you can select this option you must make the endpoint that joins the two subranges the active point. 7-10 Section 7 -- Using LDW 2: Assessing
When you select the SUF::Delete Split Point option, LDW combines the two ranges and adjusts the SUF curve for the new (combined) sub-range to pass through the active point. The active point becomes the midpoint for the combined sub-range. Moving an Endpoint. You can move an active endpoint of a subrange in the same ways you can move a sub-range's midpoint. You can move the point by dragging it with your mouse. You can also enter new values for the point's level and utility in the edit boxes at the bottom of the SUF assessment window. You can move an endpoint anywhere in the rectangle defined by the two closest endpoints on the horizontal axis and the zero and one utility points on the vertical axis. You can raise or lower the endpoints of the entire measure range but you can't move them horizontally. This ability to move the endpoints of a measure's range lets you define SUF curves with their most preferred or least preferred levels in the middle of a measure's range instead of at the ends. See page 7-14 for more details on non-monotonic SUFs. When you move an endpoint, LDW initializes the SUF curves for the adjacent sub-ranges to straight lines. Initializing a Sub-Range. You can reset the SUF curve for the active sub-range by selecting the SUF::Reset Range option. When you select this option, LDW resets the SUF curve for the subrange to a straight line. Formal Methods of Setting a Point’s Utility. Up till now, there has been no discussion of how to assign a utility to a particular level. LDW provides two methods for doing this by posing preference questions to the decision maker. The “Utility” method asks the decision maker to compare hypothetical certain and uncertain outcomes. The “Value” method asks the decision maker to identify the point that is preferentially halfway between two endpoints. Assessing Utility. You can use the SUF::Assess Utility option to assess the utility of the active point with a probability question. When you select this option, LDW displays the screen shown in Figure 7-4. This screen compares a certain outcome (labeled A) with a lottery (or uncertain outcome, labeled B). A and B represent simplified hypothetical alternatives that differ only on a single measure. Section 7 -- Using LDW 2: Assessing 7-11
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- Page 86 and 87: ! Summary -- view a dialog box that
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- Page 106 and 107: Figure 6-12. Example of a measure l
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When you select the SUF::Delete Split Point option, LDW<br />
combines the two ranges and adjusts the SUF curve for the new<br />
(combined) sub-range to pass through the active point. The active<br />
point becomes the midpoint for the combined sub-range.<br />
Moving an Endpoint. You can move an active endpoint of a subrange<br />
in the same ways you can move a sub-range's midpoint.<br />
You can move the point by dragging it with your mouse. You can<br />
also enter new values for the point's level and utility in the edit<br />
boxes at the bottom of the SUF assessment window. You can<br />
move an endpoint anywhere in the rectangle defined by the two<br />
closest endpoints on the horizontal axis and the zero and one<br />
utility points on the vertical axis. You can raise or lower the<br />
endpoints of the entire measure range but you can't move them<br />
horizontally. This ability to move the endpoints of a measure's<br />
range lets you define SUF curves with their most preferred or<br />
least preferred levels in the middle of a measure's range instead of<br />
at the ends. See page 7-14 for more details on non-monotonic<br />
SUFs.<br />
When you move an endpoint, LDW initializes the SUF curves for<br />
the adjacent sub-ranges to straight lines.<br />
Initializing a Sub-Range. You can reset the SUF curve for the<br />
active sub-range by selecting the SUF::Reset Range option. When<br />
you select this option, LDW resets the SUF curve for the subrange<br />
to a straight line.<br />
Formal Methods of Setting a Point’s Utility. Up till now, there<br />
has been no discussion of how to assign a utility to a particular<br />
level. LDW provides two methods for doing this by posing<br />
preference questions to the decision maker. The “Utility” method<br />
asks the decision maker to compare hypothetical certain and<br />
uncertain outcomes. The “Value” method asks the decision<br />
maker to identify the point that is preferentially halfway between<br />
two endpoints.<br />
Assessing Utility. You can use the SUF::Assess Utility<br />
option to assess the utility of the active point with a probability<br />
question. When you select this option, LDW displays the screen<br />
shown in Figure 7-4. This screen compares a certain outcome<br />
(labeled A) with a lottery (or uncertain outcome, labeled B). A<br />
and B represent simplified hypothetical alternatives that differ<br />
only on a single measure.<br />
Section 7 -- Using LDW 2: Assessing 7-11
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