Logical Decisions - Classweb

When you have selected two members you would like to
compare, click the "Assess" button. You will see a dialog box that
lets you directly enter the ratio of the weights for the two
measures.
If you selected a goal and you had previously selected the "Allow
Representatives for Sub-Goals" option in the assess weights dialog
box, LDW would next ask you to select a representative for the
goal to use in the ratio.
After you return to the tradeoff assessment dialog box from
assessing a weight ratio, the ratio you assessed will be added to
the list titled "Previous Tradeoffs." To complete the assessments
for the goal, you will need to assess as many weight ratios as
there are active members (less one).
To assess more ratios, just select two more members (one from
each list) and click the "Assess" button to begin the assessment for
the next ratio. Continue this process until you see "No new
tradeoffs needed" in the "First Member:" list. Now you can click
the "Done" button to return to the assess weights dialog box.
You can modify a weight ratio you have already assessed by
clicking on its name in the list labeled "Previous Tradeoffs" in the
tradeoff assessment dialog box and clicking the “Review” button.
When you do this you will see the dialog box for assessing weight
ratios with the previously entered ratio as the default.
Assessing Weights with the Analytic Hierarchy Process
The Analytic Hierarchy Process (AHP) is a variation on the
pairwise weight ratios method for assessing weights. However,
instead of selecting a minimum number of pairs of members to
assess weight ratios for, you enter ratios for all possible pairs of
members. Since you enter more ratios than are strictly needed,
they are likely to be inconsistent. The AHP method then uses an
approach based on linear algebra to compute a best fit set of
weights based on the weight ratios you enter.
The AHP method for assessing weights is like the AHP method
for converting measure levels to common units. You will enter
the weight ratios in the same matrix used for AHP common
units.
You begin the AHP weight assessment process by selecting the
"Analytic Hierarchy Process" assessment method and clicking the
"Assess" button in the assess weights dialog box.