This section introduces the suggested approach, which is based on fuzzy numbers and was developed to aid in the selection of agricultural production techniques in Turkey. The methodology described here is based on the B-FAHP and F-TOPSIS methodologies. Following a fundamental definition of the fuzzy number idea, the steps of the B-FAHP and F-TOPSIS processes, improved with fuzzy numbers, were addressed. Following that, the proposed approach was developed in further detail. The purpose of this study was to develop a hybrid MCDM model for agricultural selection using an AHP-based fuzzy set in combination with a TOPSIS-based fuzzy set.
3.2. Fuzzy AHP
AHP is a quantifiable approach for structuring multi-person situations hierarchically in order to simplify solutions. While this approach works well with both qualitative and quantitative data, it cannot accurately reflect human thinking styles. Intermittent evaluations are typically more dependable for the decision-maker than definitive evaluations [
24]. AHP is the most often used approach within MCDM. Saaty developed it to provide a consistent and simple method for analyzing complicated circumstances. It compares possible pairings in order to weight each factor and calculate a consistency ratio for a complicated circumstance. AHP employs a tree structure to decompose big issues into more manageable subproblems.
The procedure has four major steps:
Creating a tree structure with one aim, criteria, and solutions.
Evaluating options by each criterion.
Pairwise comparisons with subjective weighting factor computation
Synthesis of results from stages 2 and 3 to compute total evaluation of options based on goal achievement.
One of AHP’s key features is its multiple-criteria decision-making tool. The approach compares the relative weights of factors to define priorities and make the optimal decision [
25]. AHP is a valuable logical technique for resolving a variety of MCDM issues in a wide variety of technological and scientific disciplines. AHP is especially advantageous for decision-making, including subjective judgment, because it may combine both concrete and intangible factors [
6].
To deal with uncertainty, AHP was extended to fuzzy sets theory, and fuzzy AHP (FAHP) was formed. FAHP has been used to evaluate the quality of in-flight service, categorize container terminals, and perform traffic accessibility criterion prioritization. We selected Buckley’s (1985) technique due to its low level of criticism in the literature. Application procedure.
Due to AHP’s simplicity, ease of implementation, and adaptability, it has become a highly effective logical solution for MCDM problems in a wide variety of domains of technology and research. AHP has the advantage of incorporating both concrete and intangible components in decision-making procedures that require subjective judgments.
The AHP technique appears to be very beneficial in assisting with goal prioritization and overall impact assessments.
To determine the priority of the objectives, managers from various departments were examined individually. The AHP method was used to prioritize objectives and align them with various perspectives. The AHP process included the following steps:
- (1)
examining the “criticalities” affecting the objectives in order to identify their relevance;
- (2)
quantifying the importance of each objective in respect to the others; and
- (3)
determining the objective weights [
8].
The AHP method is generally divided into three steps as follows:
As a result, AHP is being developed using fuzzy sets to address hierarchical fuzzy difficulties.
The FAHP approach is divided into various phases. There are several methods for allocating weights to criteria based on their relative relevance. Buckley’s technique [
26] was used to determine the fuzzy priority of comparison ratios with triangle membership functions.
The steps of the procedure are as follows:
Step 1: Triangular fuzzy (TF)
The fuzziness of a pairwise comparison matrix is increased. Using linguistic notions, DMs construct a pairwise comparison matrix. Anagnostopoulos et al. (2007) converted replies to fuzzy integers using a nine-point scale [
27] (see
Table 2).
Table 2 shows how decision-makers compare the criteria in terms of linguistic terms and their TF scale.
The pairwise contribution matrices are depicted in Equation (6).
Step 2: The average calculation of choices of decision-makers (ACCDM)
If there are several decision-makers, the ACCDM (
) is calculated, as shown in Equation (7).
On the basis of Equation (8), the pairwise contribution matrices are updated in this context.
Step 3: Geometric mean (GM)
To paraphrase Buckley, the generalized mean is calculated for fuzzy comparison values of all criteria, as indicated in Equation (9).
Step 4: Calculation of Fuzzy Weight of Criterion (FWC)
The FWC as defined in Equation (10) should be found, as well as the steps. Vector summation is found for each .
After determining the inverse of vector summation, the FT number is modified.
is multiplied by the reverse vector to obtain FWC.
Step 5: Average of the Fuzzy Weight of the Criterion (AFWC)
Step 6: Normalization Mi
The normalization of Mi is calculated.
3.3. Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS)
Each plan is then compared to the ideal and worst hypothesized plans in order to decide which is the best. TOPSIS is a frequently utilized evaluation technique for multi-objective decision-making in transportation. It is increasingly utilized throughout the risk assessment process. This technique requires little more than fundamental mathematics and thinking, so it can be regarded as simple. This is referred to in this instance as the fuzzy TOPSIS technique. It performs computations identical to those of TOPSIS. It proceeds as detailed in [
29].
Hwang and Yoon [
30] created TOPSIS, an MCDM technique based on the positive ideal solution (PIS) and negative ideal solution (NIS). The PIS maximizes benefit while minimizing cost, whereas the NIS minimizes benefit while maximizing cost [
31,
32].
Assume there are m units, A = {A1, …, Am} and each unit evaluates n distinct decision criteria. In general, each choice is weighed against the n criteria.
Assume C is a collection of criteria. TOPSIS is managed in six steps as follows:
Step 1: Create a decision matrix and assign a weight to each criterion
Create a decision matrix with
m possibilities and
n criteria, guided by each alternative and criterion.
Step 2: Calculation of a decision matrix with a normalized decision matrix
All values can be normalized using several standardized forms. Some of the most prominent ways are the following:
where
Step 3: Determine the weighted normalized decision matrix
To obtain the weighted normalized decision matrix, multiply each column of the
R matrix by the
wi value.
Step 4: Determine a positive ideal solution (PIS) and negative ideal solution (NIS)
Determine the PIS and NIS. The PIS is the solution that maximizes benefit and minimizes expense, whereas the NIS maximizes cost and minimizes benefit.
NIS
where
i is the benefit criteria and
j is the cost criteria, respectively.
Step 5: Calculate the separation of each alternative
The separation of each alternative is applied to calculate the measures
and
and for each of the units is given as
Step 6: Calculate the solution’s relative proximity to the ideal solution
The alternative’s relative proximity is shown by the following:
3.4. Fuzzy TOPSIS
Step 1: Create a fuzzy decision matrix to rank options
Numerous applications of crisp and fuzzy TOPSIS have been carried out in recent years in a variety of fields, including the selection of information and communication technology projects, the evaluation of companies’ competence or financial viability, the analysis of investment projects, business communications, and other strategic decisions [
33].
After selecting the ranking choices, make a matrix using linguistic terms. Equation (21) illustrates how alternatives perform. The scales and triangle membership functions used are listed in
Table 2 [
34].
where
Step 2: The Fuzzy Decision Matrix has to be normalized
Equation (22) is used to normalize the decision matrix, and the normalized matrix is used to calculate the decision matrix represented by
Step 3: Determine the weighted normalized fuzzy decision matrix for the situation
Then, using Equation, a weighted normalized fuzzy decision matrix is generated (Equation (23) and is expressed by
. In the equation,
wi represents the criterion weight obtained from
Section 3.2.
Step 4: Calculate both the fuzzy positive ideal and negative ideal solutions
For the specified criterion, the fuzzy PSI and fuzzy NSI reflect the maximum and minimum values obtained from the weighted normalized fuzzy decision matrix, respectively, among all the alternatives. This is determined using Equations (24) and (25).
Step 5: Determine the Euclidian distance
Using Equations (26) and (27), the Euclidian distance of each alternative is determined from FPIS and FNIS, respectively.
Step 6: Determine the closeness coefficient
Equation (28) is used to determine the closeness coefficient for each alternative option, where 0 ≤
CCf ≤ 1.