Logical Decisions - Classweb

very different from the average of the two prices of $12,000
dollars. You locate the mid-preference level by using the mouse
to drag B to the left or right along the line connecting alternatives
A and C. You can also enter the mid-preference level directly in
the edit box at the bottom of the screen. LDW will use the mid
preference level as the level for the active point and will set the
active point's utility as the average of the utilities for A and C in
the main preference assessment screen. Click on the "Done"
button to indicate that you have finished.
Completing the SUF Assessment. When your SUF curve looks
the way you want it, you can save it and return to the common
units dialog box by clicking on the "Done" button at the left of the
SUF assessment window.
If you want to discard the changes you have made, click on the
"Cancel" button. LDW will restore the SUF curve to its original
shape and you will return to the common units dialog box. The
SUF::Done and SUF::Cancel options echo the functions
of these buttons.
Before LDW saves a SUF, it checks to see that at least one level
receives the most preferred utility (usually one) and that at least
one level receives the least preferred utility (usually zero). If
these conditions are not met, LDW adjusts the vertical range of
the SUF curve until they are.
When you are finished, LDW updates the active measure's SUF
assessment status to "Assessment Complete."
Creating a non-monotonic SUF.. Occasionally it is useful to
have a utility function that has its most or least preferred level in
the middle rather than at an endpoint. An example might be
body temperature in a medical application. Its better to be at 98.6º
F than above or below that ideal number. You can do this as
follows:
7-14 Section 7 -- Using LDW 2: Assessing