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Flashcards in MCDA Deck (19)
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1

Preference relationships

Strict preference order
Indifference order
Weak preference order

2

Alternative

also known as attribute
product, policy etc.

3

Additive Value Function (description)

most commonly used
5 criteria that must be satisfied
preferential indépendance, corresponding trade off, interval scale, casing constants, linear/complete compensation

4

Multiplicatively Value Function

multiplication
take logarithms turns into additive

5

Satisfying levels

Simon 1976
Set a satisfactory level of performance for the most important attribute
Eliminate alternatives
Repeat steps for next most important alternative
Can model on an graph with criteria on each axis
Satisfice because unable to maximise
Useful at preliminary stages and routine decisions
Based on bounded rationality
is NOT a prescriptive model

6

Satisfying levels too strict?

Only one alternative remains but still significant attributes not taken into account
Need to be less demanding

7

Scoring

Assessing values

8

Local Scale

Best alternative in a decision matrix is 1 and worst is 0

9

Global Scale

End points defined by the tideland worst performance which could realistically occur

10

Methods of assigning weights

AHP
Direct

11

Weights

Must sum to 1
Can only be between 0 and 1

12

Analytical Hierarchy Process (AHP) (Description)

Matrix with attributes down either side
Comparing two attributes against each other
Aij = K, then Aji = 1/K and Aii = 1

13

Initial Screening Methods

Dominance
Satisficing
Disjunctive

14

Dominance (initial screening)

Delete any dominate alternatives from further considerations
If there is obviously one which is far behind the others in all areas

15

Satisficing (initial screening)

Simons 1976 model

16

Disjunctive (initial screening)

set a threshold value for each criterion

17

Lexigraphic approach

Rank attributes and compare alternatives used after satisficing and dominance

18

Additive value function (method)

1 - Measure each alternative on its performance against another alternative
2 - subjective opinion (utility or value)
3 - apply a wight to each alternative to represent relative importance
4 - find the added value on each alternative (weight x v)

19

Analytical Hierarchy Process (AHP) (method)

1 - matrix
2 - abnormal calculations
3 - weighted then given by average
4 - find AW
5 - consistency check