A new proposed model of restricted data envelopment analysis by correlation coefficients

Mecit, Emine Demet; Alp, İhsan

doi:10.1016/j.apm.2012.07.010

Cited by 25 publications

(8 citation statements)

References 37 publications

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“…The CCR model assumes constant returns to scale (CRS) (Mecit and Alp, 2013). The BCC estimates the pure technical efficiency with reference to the efficient frontier (Banker et al, 1984).…”

Section: Methodsmentioning

confidence: 99%

Changes in the Milk Market in the United States on the Background of the European Union and the World

Bórawski¹,

Kalinowska²,

Mickiewicz³

et al. 2021

ERSJ

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The study analyzed the number of dairy cows, milk yield of cows, milk production, import, export and consumption of milk and milk products in the USA. In the analysis of the research results, tabular, graphic and descriptive methods were used. Findings: United States (U.S.) dairy farms used to be most efficient in the world. The average herd of dairy cow is 115 head in the United States of America (USA) and 22 in the European Union (EU). The vast majority of cow's milk production (85%) comes from dairy herds having more than 100 head. The analysis shows that the milk yield of cows and milk production in the USA increased, with a slight increase in the number of cows. Practical Implications: During the analyzed period, the USA increased the consumption of dairy products, while the consumption of liquid milk has decreased. Originality/Value: In 2009-2018, the trade balance was positive Data Envelopment Analysis (DEA) method -CCR, BCC and NIRS model focused on input-oriented minimization were used.

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“…The CCR model assumes constant returns to scale (CRS) (Mecit and Alp, 2013). The BCC estimates the pure technical efficiency with reference to the efficient frontier (Banker et al, 1984).…”

Section: Methodsmentioning

confidence: 99%

Changes in the Milk Market in the United States on the Background of the European Union and the World

Bórawski¹,

Kalinowska²,

Mickiewicz³

et al. 2021

ERSJ

View full text Add to dashboard Cite

show abstract

“…To avoid this shortcoming, weight restrictions should be added to Equation (Angulo‐Meza & Lins, ; Cherchye et al, ; Mecit & Alp, ). In this paper, the virtual weight restrictions first proposed by Wong and Beasley () are used.…”

Section: Methodsmentioning

confidence: 99%

Benefit of the doubt approach to assessing the research performance of Australian universities

Szuwarzyński

2018

Higher Education Quarterly

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This paper proposes a benefit of the doubt (BoD) approach to assess the research performance of 37 public Australian universities based on data from 2015. The primary activities of Higher Education institutions are teaching and research, but the prestige of a university depends mainly on the results of its research activities. The BoD method is rooted in the data envelopment analysis methodology, which enables the flexible and data‐based assignment of weights to aggregated variables. Full weighting flexibility, however, allows zero weights, which can lead to unrealistic results. For this reason, the proposed model has been supplemented with additional weight restrictions. The assessment considers key performance factors: number of publications and citations; number of completed doctoral degrees; amount of research grants; and percentage of science graduates. Unlike earlier research on Australian universities, this study uses the number of publications and citations from the Web of Science database. The results provide a ranking of universities and recommendations for decision makers regarding the direction of future improvement actions for the worst‐performing universities.

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“…Values of the correlation coefficient are always between –1 and +1. A correlation coefficient of +1 indicates that two variables are perfectly related in a positive linear sense, a correlation coefficient of –1 indicates that two variables are perfectly related in a negative linear sense, and a correlation coefficient of 0 indicates that there is no linear relationship between the two variables [12] . In this study, Pearson correlation was used to describe the relationship between two continuous variables that are both normally distributed.…”

Section: Methodsmentioning

confidence: 99%

Study on the grading standard of Panax notoginseng seedlings

Chen

Yang

et al. 2018

Journal of Ginseng Research

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BackgroundThe quality differences in seedlings of medicinal herbs often affect the quality of medicinal parts. The establishment of the grading standard of Panax notoginseng seedlings is significant for the stable quality of medicinal parts of P. notoginseng.MethodsTo establish the grading standard of P. notoginseng seedlings, a total of 36,000 P. notoginseng seedlings were collected from 30 producing areas, of which the fresh weight, root length, root diameter, bud length, bud diameter, and rootlet number were measured. The K-means clustering method was applied to grade seedlings and establish the grading standard.ResultsThe fresh weight and rootlet number of P. notoginseng seedlings were determined as the final indices of grading. P. notoginseng seedlings from different regions of Yunnan could be preliminarily classified into four grades: the special grade, the premium grade, the standard grade, and culled seedlings.ConclusionThe grading standard was proven to be reasonable according to the agronomic characters, emergence rate, and photosynthetic efficiency of seedlings after transplantation, and the yields and contents of active constituents of the medicinal parts from different grades of seedlings.

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A new proposed model of restricted data envelopment analysis by correlation coefficients

Cited by 25 publications

References 37 publications

Changes in the Milk Market in the United States on the Background of the European Union and the World

Changes in the Milk Market in the United States on the Background of the European Union and the World

Benefit of the doubt approach to assessing the research performance of Australian universities

Study on the grading standard of Panax notoginseng seedlings

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