Logical Decisions - Classweb

The options associated with this assess SUFs window will let you
change the shape of the SUF curve by breaking it into pieces
(called sub-ranges) and by changing any sub-range from a
straight line to a curve. Initially there is only one sub-range -- the
whole curve.
LDW highlights the active sub-range on the graph in green. The
shape of the curve for the sub-range is defined by three points -the
lowest and highest levels for the sub-range and the active
point marked by a green square near the middle of the sub-range.
LDW shows the location of the active point in the two edit boxes
at the bottom of the SUF assessment window.
When you begin a SUF assessment, LDW adds the SUF menu to
the main menu. The SUF menu has the following options:
! Done -- save the current SUF and return to the
Common Units dialog box.
! Reset Range -- return the current SUF range to its default
(straight line) value.
! Split Range -- split the active range into two parts at the
active point.
! Delete Split Point -- combine the two sub-ranges
separated by the active point.
! Assess Utility -- assess the utility of the active point
by asking a probability question.
! Assess Value -- assess the utility of the active point
using the "mid-level splitting" method.
! Cancel -- save the current SUF and return to the
Common Units dialog box.
The discussion on page 9-15 describes the assess utility
(probability) and assess value (mid-level splitting) methods for
assessing the shape of the SUF curve for a measure. How these
methods are implemented in LDW is discussed below.
Changing the Shape of the Active Sub-Range. The SUF curve
for the active sub-range always passes through the active point.
Section 7 -- Using LDW 2: Assessing 7-9