Croatian Operational Research Review最新文献

A novel modified Khatter’s approach for solving Neutrosophic Data Envelopment Analysis 一种新的改进Khatter的方法来解决中性数据包络分析

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0002

Kshitish Kumar Mohanta, D. Sharanappa, A. Aggarwal

{"title":"A novel modified Khatter’s approach for solving Neutrosophic Data Envelopment Analysis","authors":"Kshitish Kumar Mohanta, D. Sharanappa, A. Aggarwal","doi":"10.17535/crorr.2023.0002","DOIUrl":"https://doi.org/10.17535/crorr.2023.0002","url":null,"abstract":"The evaluation of the performance of decision-making units (DMUs) that use comparable inputs to produce related outputs can be accomplished through a non-parametric linear programming (LP) technique called Data Envelopment Analysis (DEA). However, the observed data are occasionally imprecise, ambiguous, inadequate, and inconsistent which may result in incorrect decision-making when these criteria are ignored. Neutrosophic Set (NS) is an extension of fuzzy sets which is used to represent unclear, erroneous, missing, and wrong information. This paper proposes a neutrosophic version of the DEA model, and a novel solution technique for Neutrosophic DEA (Neu-DEA) model. The possibility mean for triangular neutrosophic number (TNN) is redefined and modified the Khatter’s approach to convert directly the Neu-DEA model into its crisp DEA model. As a result, the Neu-DEA model is simplified to a crisp LP problem with a risk parameter (δ ∈ [0, 1]) that represents the attitude of the decision-maker towards taking risk. The efficiency score of the DMUs is computed by using various risk factors and divided into efficient and inefficient groups. The ranking of DMUs is determined by calculating the mean efficiency score of DMUs, which is based on various risk parameters. A numerical example is illustrated here to describe the suggested approach’s flexibility and authenticity and compared with some of the existing approaches.","PeriodicalId":44065,"journal":{"name":"Croatian Operational Research Review","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42900770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Behavioural antecedents of Bitcoin trading volume 比特币交易量的行为前提

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0008

Blanka škrabić Perić, Petar Sorić, Ivana Jerković

{"title":"Behavioural antecedents of Bitcoin trading volume","authors":"Blanka škrabić Perić, Petar Sorić, Ivana Jerković","doi":"10.17535/crorr.2023.0008","DOIUrl":"https://doi.org/10.17535/crorr.2023.0008","url":null,"abstract":"This paper aims to examine the behavioural determinants of Bitcoin trading volume within a cross-country framework of 14 world economies plus the Eurozone. We introduce a basic taxonomy of behavioural indicators, distinguishing between consumer confidence, economic policy uncertainty (EPU), and indicators of financial volatility. Our estimations reveal that the Bitcoin trading volume can be predicted more accurately by EPU than by any other class of indicators. Finally, we identify the COVID-19 shock as a catalyst for a psychologically-driven Bitcoin market and find evidence that Bitcoin was a macro hedging instrument in the pandemic. To obtain our results, we conducted a panel Granger causality test, employing the Least Squares Dummy Variables (LSDV) estimator. Contrary to previous research, we found that market fundamentals (industrial production and equity market volume) became significant drivers of Bitcoin trading during the pandemic. This conclusion was preserved when we used the LSDV corrected estimator, which is more suitable for panels with a smaller time dimension. Apart from the practical implications for traders, this paper provides researchers with detailed steps for applying Granger causality testing in panel data settings.","PeriodicalId":44065,"journal":{"name":"Croatian Operational Research Review","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46945395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving portfolio liquidity 提高投资组合流动性

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0003

Dujam Kovač, Doris Podrug

引用次数: 1

Macroeconomic impacts of COVID-19 pandemic first wave in the world 全球第一波COVID-19大流行对宏观经济的影响

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0006

Karol Szomolányi, Martin Lukáčik, Adriana Lukacikova

引用次数: 0

Estimating outputs using an inverse non-radial model with non-discretionary measures 使用具有非自由裁量测度的逆非径向模型估计产出

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0004

M. J. S. Noveiri, S. Kordrostami, Rahim Rahimi Anarestani

{"title":"Estimating outputs using an inverse non-radial model with non-discretionary measures","authors":"M. J. S. Noveiri, S. Kordrostami, Rahim Rahimi Anarestani","doi":"10.17535/crorr.2023.0004","DOIUrl":"https://doi.org/10.17535/crorr.2023.0004","url":null,"abstract":"Few inverse data envelopment analysis (DEA) models have incorporated non-discretionary measures based on radial efficiency values. However, the efficiency may be miscounted in radial approaches when some non-zero slacks appear. Furthermore, there is scant research on inverse DEA to estimate performance measures in the restaurant industry. Accordingly, this research proposes models based on non-radial DEA to analyze the efficiency and output changes of some Iranian restaurants while also presenting non-discretionary measures. Actually, in the company of non-discretionary factors, a non-radial DEA approach and its inverse problem are introduced to assess the performance and estimate the outputs for the modifications of inputs, respectively, while the inefficiency levels are maintained (and when they are preserved or decreased). The inefficiency of each discretionary input and output is specified using the presented non-radial DEA approach, and output targets are determined through inverse non-radial DEA with non-discretionary inputs. The results show containing non-discretionary data leads to more rational determinations through non-radial DEA-founded problems. This research presents analytic insights into the resources of inefficiency and output targets of entities with non-discretionary data, such as restaurants.","PeriodicalId":44065,"journal":{"name":"Croatian Operational Research Review","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46270536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multivariate analysis of post-transition OECD countries in the context of inequality measures 经济合作与发展组织国家在不平等措施背景下的多变量分析

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0005

Tomislav Korotaj, Nataša Kurnoga, N. Šimurina

{"title":"Multivariate analysis of post-transition OECD countries in the context of inequality measures","authors":"Tomislav Korotaj, Nataša Kurnoga, N. Šimurina","doi":"10.17535/crorr.2023.0005","DOIUrl":"https://doi.org/10.17535/crorr.2023.0005","url":null,"abstract":"The aim of this paper is to classify the post-transition OECD countries according to the Gini coefficient for income inequality, the S80/S20 ratio, the income share of the bottom 40% of the population, educational attainment – tertiary education, and labor force participation rate using factor and cluster analyses. Factor analysis resulted in two extracted factors, and factor scores were calculated. Hierarchical and non-hierarchical cluster analysis was performed on factor scores to classify eight posttransition OECD countries and three candidate countries. The research question of this paper is to investigate whether there are similarities/differences between existing members and candidates for membership in the OECD, among the selected post-transition countries of Europe, in the context of income inequality. Based on the dendrogram obtained by the hierarchical Ward’s method, a three cluster solution was selected. The non-hierarchical k-means method for the three-cluster solution clustered Croatia with Bulgaria and Romania. These three countries are OECD candidate countries. Our findings confirm that the three candidate countries remain behind because of historical reasons and the non-implementation of structural reforms.","PeriodicalId":44065,"journal":{"name":"Croatian Operational Research Review","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48657461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Economic complexity and income inequality in EU countries 欧盟国家的经济复杂性与收入不平等

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0007

Boris Cota, N. Erjavec, S. Jakšić

引用次数: 0

PollenNet - a deep learning approach to predicting airborne pollen concentrations PollenNet -一个预测空气中花粉浓度的深度学习方法

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Croatian Operational Research Review Pub Date : 2023-07-10 DOI: 10.17535/crorr.2023.0001

Rebeka Čorić, Domagoj Matijevic, Darija Markovic

引用次数: 0

On impact of statistical estimates on precision of stochastic optimization 统计估计对随机优化精度的影响

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Croatian Operational Research Review Pub Date : 2022-12-22 DOI: 10.17535/crorr.2022.0017

P. Volf

引用次数: 0

No country for old men? Microsimulation effects of activating pensioners on the labour market 没有适合老年人的国家？激活养老金领取者对劳动力市场的微观刺激效应

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Croatian Operational Research Review Pub Date : 2022-12-22 DOI: 10.17535/crorr.2022.0016

Nora Mustać, Velibor Mačkić, Lucija Rogić Dumančič

{"title":"No country for old men? Microsimulation effects of activating pensioners on the labour market","authors":"Nora Mustać, Velibor Mačkić, Lucija Rogić Dumančič","doi":"10.17535/crorr.2022.0016","DOIUrl":"https://doi.org/10.17535/crorr.2022.0016","url":null,"abstract":"Being a pensioner in Croatia carries certain risks of poverty and inequality compared to the rest of the population. Low level of average pension compared to the minimal wage is just one case in point. On the other hand, the labour market shortage is not negligible and there is also a poor track record when it comes to pension system reforms in the last two decades. This paper investigates a possible path of the future pension system reform aimed at increasing household income levels -- focused on the labour market participation of people aged 65+ who are willing and able to solve labour shortages present in the market. The general aim of the paper is to analyze the effects that the establishment of the Pensioners Service Center might have on market income, mean household income by decile groups, poverty and inequality indices. It fills the research gap by conducting the first microsimulation of the pension system reform in Croatia focusing on market income. The hypothetical reform is simulated using the tax--benefit microsimulation model EUROMOD based on EU--SILC 2019 data for Croatia. Results confirm market income as the main cause of income inequality as well as that the second decile is the target group of the proposed intervention. Pensioners have a clear monetary incentive to increase their labour supply, which in return decreases all poverty and inequality indices.","PeriodicalId":44065,"journal":{"name":"Croatian Operational Research Review","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43020906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0