Index analysis of DEMATEL model

One 、 application

Dematel It is a systematic analysis method that uses graph theory and matrix tools to explain problems . Through the logical relationship between the elements in the system and the direct influence matrix , The influence degree of each element on other elements and the degree of being affected can be calculated , Thus, the cause degree and center degree of each element can be calculated , As the basis for constructing the model , So as to determine the causal relationship between the elements and the status of each element in the system .

Two 、 operation

SPSSAU operation

（1） Click on SPSSAU Comprehensive evaluation ‘DEMATEL’ Button . Here's the picture

（2） Drag and drop the data and click start analysis

3、 ... and 、 Analysis steps

Four 、 analysis

Put data into analysis box ,SPSSAU The system automatically generates analysis results , These include 5 Tables and 2 Map

1. The relational matrix

Purpose ： The original input data , Repeat the presentation to make sure the data is correct

2. The specification directly affects the matrix

Yes ‘ The relational matrix ’ Normalized result matrix

3. Comprehensive impact matrix T

PS： Comprehensive impact matrix T = The specification directly affects the matrix * ( Unit matrix - Canonical direct matrix ) The inverse matrix .

4.DEMATEL Calculate the index value

Indicators in the figure above ：

（1） Influence degree D value

（2） Affected degree C value

（3) Centrality D+C value

(4) Causal degree D-C value

5. Element weight value

The above table shows the weight values of each element , Centrality D+C value ： Its meaning is the role of an element in the system , A higher value means that the element is more important ; So for ‘ Centrality D+C value ’ After normalization , That is, get the weight value of each element .

6. Centrality - Cause map

7. Influence degree - Affected degree diagram

SPSSAU Diagrams are also provided

The comprehensive impact diagram shows the impact relationship of the elements ;