A New Method for MAGDM Based on Improved TOPSIS and a Novel Pythagorean Fuzzy Soft Entropy
Abstract
:1. Introduction
2. Preliminaries
3. Pythagorean Fuzzy Entropy and Pythagorean Fuzzy Soft (PFS) Entropy
- (D1)
- (D2)
- iff
- (D3)
- (D4)
- (P1)
- (P2)
- (P3)
- (P4)
4. Integrated Weight of Attributes Based on the PFS Entropy
5. Multiple-Attribute Group Decision Making (MAGDM) Method Based on the Novel Pythagorean Fuzzy Soft Entropy
- Step 1.
- Suppose that there are experts whose weight vector is giving evaluation values under jth attribute. By the formula (8), we now obtain the overall evaluation value as follows.
- Step 2.
- Let be the universe of discourse and be a set of parameters. We can establish a binary table form of PFSSs as Table 1.
- Step 3.
- Calculate fuzzy entropy of different attributes on Pythagorean fuzzy soft sets by utilizing Equation (12).
- Step 4.
- Obtain the objective weight and integrated weight of attribute by utilizing Equation (13) and Equation (14).
- Step 5.
- Determine alternatives’ positive ideal solution (PIS) and negative ideal solution (NIS) in Pythagorean fuzzy model for synthetic judgement as follows:For benefit attributes: whereFor cost attributes: whereZhang [25] determine PIS and NIS for each attribute according to score function of each element (). But their score function are pointed out that the comparison result is sometimes unreasonable [10,30]. And our method also has another advantage which possesses higher distinguish degree. Because the distance between alternatives and PIS or NIS will be larger with our method in same distance measure. It is obvious that any elements in our PIS will be better than [25] under several laws of comparing PFNs [9,25,30].
- Step 6.
- Calculate the weighted Pythagorean fuzzy distance between alternative and positive ideal solution(PIS) and the weighted Pythagorean fuzzy distance between alternative and negative ideal solution (NIS) . We think the four parameters are equal here.
- Step 7.
- Calculate the relative closeness coefficient [34] to the Pythagorean ideal solution.
- Step 8.
- Rank the alternatives according to the above relative closeness coefficient . The lager the is, the better the alternative is.
6. Illustrative Example
- Step 1.
- Now we consider a simple condition. The three experts’ weight vector is equal. By the Formula (8), we can obtain the overall evaluation values.
- Step 2.
- We establish a binary table form of PFSSs as Table 3 according to the overall evaluation values.
- Step 3.
- Calculate fuzzy entropy by utilizing Equation (12)
- Step 4.
- Experts give their subjective weights vector after careful consideration and discussion. Calculate the objective weight and integrated weight of the attribute by utilizing Equations (13) and (14). The results of calculating are shown in Table 4.
- Step 5.
- Determine the alternatives’ positive ideal solution and negative ideal solution by utilizing Equations (15) and (16).
- Step 6.
- Calculate the weighted distance and by utilizing Equations (17) and (18).
- Step 7.
- Calculate the relative closeness coefficient to the Pythagorean ideal solution by utilizing Equation (19).
7. Conclusions
- (1)
- We combined PFSs and soft sets which have advantages in handling vague and uncertain information.
- (2)
- In most cases, experts may only be familiar with some particular attributes. We considered this situation and introduced a method to aggregate evaluation information.
- (3)
- We redefined PF entropy and proposed novel PF and PFS entropy measures which are more reasonable and valid.
- (4)
- To better determine the weights of attributes, we used PFS entropy to obtain objective weights. Then we combined objective weights and experts’ subjective weights which includes decision makers’ subjective intention to obtain integrated weights.
- (5)
- To better apply the TOPSIS method in PFSSs, we introduced more reasonable ways of determining positive ideal solutions, negative ideal solutions and calculating distances between PFNs, etc.
Author Contributions
Funding
Conflicts of Interest
References
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e1 | e2 | … | en | |
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… | ||||
… | ||||
… | … | … | … | … |
… |
2.1. The PFNs evaluation values of expert A | ||||||
<0.5, 0.8> | <0.7, 0.6> | <0.6, 0.3> | <0.4, 0.7> | <0.5, 0.2> | <0.8, 0.6> | |
<0.2, 0.3> | <0.5, 0.3> | <0.8, 0.4> | <0.7, 0.5> | <0.6, 0.2> | <0.7, 0.4> | |
<0.7, 0.2> | <0.8, 0.2> | <0.6, 0.6> | <0.8, 0.4> | <0.7, 0.6> | <0.4, 0.5> | |
2.2. The PFNs evaluation values of expert B | ||||||
<0.3, 0.6> | <0.7, 0.6> | <0.6, 0.3> | <0.8, 0.4> | <0.7, 0.3> | <0.4, 0.2> | |
<0.2, 0.7> | <0.6, 0.3> | <0.7, 0.6> | <0.6, 0.6> | <0.8, 0.1> | <0.7, 0.4> | |
<0.6, 0.5> | <0.3, 0.8> | <0.5, 0.7> | <0.5, 0.3> | <0.9, 0.2> | <0.7, 0.6> | |
2.3. The PFNs evaluation values of expert C | ||||||
<0.2, 0.8> | <0.7, 0.4> | <0.8, 0.2> | <0.6, 0.3> | <0.6, 0.5> | <0.8, 0.2> | |
<0.3, 0.6> | <0.1, 0.9> | <0.4, 0.6> | <0.3, 0.8> | <0.7, 0.2> | <0.9, 0.0> | |
<0.8, 0.3> | <0.6, 0.3> | <0.7, 0.6> | <0.6, 0.4> | <0.8, 0.4> | <0.3, 0.7> |
<0.5, 0.8> | <0.25, 0.45> | <0.37, 0.57> | <0.45, 0.55> | <0.8, 0.3> | |
<0.7, 0.6> | <0.6, 0.45> | <0.7, 0.3> | <0.2, 0.85> | <0.6, 0.3> | |
<0.6, 0.3> | <0.7, 0.35> | <0.7, 0.47> | <0.45, 0.65> | <0.7, 0.6> | |
<0.4, 0.7> | <0.7, 0.5> | <0.67, 0.43> | <0.4, 0.55> | <0.6, 0.4> | |
<0.5, 0.2> | <0.75, 0.25> | <0.7, 0.4> | <0.8, 0.2> | <0.8, 0.4> | |
<0.8, 0.6> | <0.55, 0.3> | <0.63, 0.37> | <0.8, 0.3> | <0.3, 0.7> |
0.24 | 0.2027 | 0.2449 | |
0.17 | 0.1855 | 0.1588 | |
0.18 | 0.1964 | 0.1780 | |
0.23 | 0.2077 | 0.2347 | |
0.18 | 0.2077 | 0.1837 |
Zhang’s method | 0.1110 | 0.1457 | 0.1711 | 0.1573 | 0.2165 | 0.1985 |
The proposed method | 0.1218 | 0.1390 | 0.1797 | 0.1439 | 0.2438 | 0.1720 |
Mean Value | ||||||
---|---|---|---|---|---|---|
Zhang’s method | 20.85 | 15.21 | 8.29 | 35.52 | 10.80 | 18.13 |
The proposed method | 10.31 | 24.42 | 21.47 | 59.93 | 43.08 | 31.84 |
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Han, Q.; Li, W.; Song, Y.; Zhang, T.; Wang, R. A New Method for MAGDM Based on Improved TOPSIS and a Novel Pythagorean Fuzzy Soft Entropy. Symmetry 2019, 11, 905. https://doi.org/10.3390/sym11070905
Han Q, Li W, Song Y, Zhang T, Wang R. A New Method for MAGDM Based on Improved TOPSIS and a Novel Pythagorean Fuzzy Soft Entropy. Symmetry. 2019; 11(7):905. https://doi.org/10.3390/sym11070905
Chicago/Turabian StyleHan, Qi, Weimin Li, Yafei Song, Tao Zhang, and Rugen Wang. 2019. "A New Method for MAGDM Based on Improved TOPSIS and a Novel Pythagorean Fuzzy Soft Entropy" Symmetry 11, no. 7: 905. https://doi.org/10.3390/sym11070905
APA StyleHan, Q., Li, W., Song, Y., Zhang, T., & Wang, R. (2019). A New Method for MAGDM Based on Improved TOPSIS and a Novel Pythagorean Fuzzy Soft Entropy. Symmetry, 11(7), 905. https://doi.org/10.3390/sym11070905