Logical Decisions - Classweb

to any particular measure level. A similar comment field is
provided in the probability dialog box for labeled levels.
Levels with labels
Measure labels let you describe the level on a measure with a brief
text description rather than a number. You define the allowable
labels in the measure's properties dialog as described on page 6-19.
To select a particular label for an alternative you first select the
level's cell in the matrix view. When you click a cell for a measure
that has labels, it turns into a combo-box showing the current label
with a drop down list of the possible levels. To select a new level
just click one of the labels in the list. The combo-box will
disappear when you select another cell.
Defining probabilities with labels. Since labels provide only a
discrete set of possible levels for a measure, LDW only allows a
discrete distribution that specifies the probability of each label on
the list.
To define a probability distribution over the labels, select the cell
for the level you want to define and select the Matrix::Define
Probability. When you select the option, LDW displays the dialog
box shown in Figure 6-17.
The left side of this dialog box has a list of the labels for the active
measure. When you select a label, its probability appears in the
edit box on the right. Initially the probability is 1.0 for the current
"point-estimate" label and zero for the other labels. You should
assign the proper probability for each label and then click "OK."
LDW will adjust your probabilities if they don't sum to one. If
only one label has a positive probability, LDW will convert the
probabilistic level to a point estimate level.
LDW displays the label with the highest probability in the Matrix
view.
Section 6 -- Using LDW 1: Structuring 6-29