scholarly journals Technical and economic efficiency analysis of the Portuguese artisanal dredge fleet

2010 ◽  
Vol 67 (8) ◽  
pp. 1811-1821 ◽  
Author(s):  
Manuela M. Oliveira ◽  
Ana S. Camanho ◽  
Miguel B. Gaspar
Keyword(s):  
Economic Efficiency ◽  
Efficiency Analysis ◽  
Target Species ◽  
Wholesale Market ◽  
Fishing Activity ◽  
Efficiency Assessment ◽  
Stock Biomass ◽  
Using Data ◽  
Analysis Models ◽  
Revenue Efficiency

Abstract Oliveira, M. M., Camanho, A. S., and Gaspar, M. B. 2010. Technical and economic efficiency analysis of the Portuguese artisanal dredge fleet. – ICES Journal of Marine Science, 67: 1811–1821. An efficiency analysis of the commercial dredge fleet operating along the south coast of Portugal between 2005 and 2007 sought to determine the efficiency of the vessels using data envelopment analysis models, considering fixed inputs (vessel power, length, tonnage, and an indicator of stock biomass) and a variable input (number of days at sea). The annual quota per vessel was also included in the model as a contextual factor. In the technical-efficiency (TE) analysis, outputs were defined by the catch weight for each of the three target species (bivalves). Using price data for each species in the wholesale market, revenue efficiency was also estimated to complement the TE analysis. The advantage of the approach lies in the ability to separate technical aspects from allocative aspects in the efficiency assessment, allowing two-dimensional graphic representation of vessel performance. The procedure allows the identification of benchmark vessels, which maximized the catch weight of the species landed, given their inputs, as well as the vessels that selected the appropriate target species to maximize the revenue of the fishing activity, given output prices. The approach also allowed the specification of targets for inefficient vessels that correspond to the catch by species, permitting revenue maximization from fishing.

ESTIMATION OF TECHNICAL, SPECIALIZED AND ECONOMIC EFFICIENCY OF CULTIVATED POTATO VARIETIES USING DATA ENVELOPE ANALYSIS METHOD (DEA) IN IRAQ FOR SPRING LUG 2018

2020 ◽  
pp. 119-131
Keyword(s):  
Technical Efficiency ◽  
Economic Efficiency ◽  
Potato Crop ◽  
Economic Status ◽  
Analysis Method ◽  
Envelope Analysis ◽  
Variable Capacity ◽  
Data Envelope Analysis ◽  
Using Data ◽  
The Stability

Research highlights the importance of potato crop, which occupies a prominent food and economic status in food security besides rice, wheat and corn at the local and global level. Despite the expansion of the cultivation of potato crop in Iraq in general and Ameriyah district in particular However, potato productivity remains substandard, this may be due to a lack of knowledge of the most efficient varieties and not to use productive resources at the levels at which technical, specialized and economic efficiency is achieved. Therefore, the aim of the research is to determine the technical, specialized and economic efficiency according to the cultivated seed category. The data envelope analysis (DEA) method was used to estimate technical, specialized and economic efficiency, assuming constant and variable capacity returns. As a result of the study, the Safrana variety achieved the highest average technical efficiency according to the stability of the yield and capacity efficiency in addition to achieving the highest average specialized and economic efficiency, The Lapadia variety achieved the highest average technical efficiency, assuming that capacity returns have changed. Therefore, we recommend the adoption of items that achieve higher efficiency and the need to redistribute the elements of production better and Achieving the optimum levels at which technical, specialized and economic efficiency is achieved and saving what has been wasted.

Neighborhood Engagement, Dogs, and Life Satisfaction in Older Adulthood

2020 ◽  
pp. 073346482095372
Author(s):  
Angela L. Curl ◽  
Jessica Bibbo ◽  
Rebecca A. Johnson
Keyword(s):  
Life Satisfaction ◽  
Social Engagement ◽  
Positive Association ◽  
Older Adulthood ◽  
Dog Walking ◽  
Dog Ownership ◽  
Using Data ◽  
Indirect Relationship ◽  
Analysis Models ◽  
Retirement Study

Objectives This study examined the relationships between dog ownership, dog walking, and the emotional bond with a dog to neighborhood engagement and life satisfaction among those over age 50. Method Using data from the Health and Retirement Study ( N = 476), two path analysis models were conducted to test the research hypotheses. Results Findings indicated that dog ownership did not have a direct or indirect relationship on life satisfaction. However, time spent in dog walking was associated with frequency of social interactions, which itself had a positive association with life satisfaction. The bond with a dog was not directly associated with life satisfaction but was associated with dog walking. Discussion Dog walking is a promising strategy for simultaneously promoting better health and social engagement, and these factors in turn can promote greater life satisfaction of older adults.

Efficiency Analysis of Malaysian General Insurance Companies Using Data Envelopment and Super-efficiency Approach

2021 ◽  
Vol 11 (10) ◽  
Author(s):  
Jamilah Mohd Mahyideen ◽  
Nur Azlina Abd Aziz ◽  
Hafisah Yaakob ◽  
Nurhanani Aflizan Mohamad Rusli ◽  
Wan Normila Mohamad
Keyword(s):  
Efficiency Analysis ◽  
Insurance Companies ◽  
Data Envelopment ◽  
Super Efficiency ◽  
General Insurance ◽  
Using Data

On the computational complexity of cost efficiency analysis models

2007 ◽  
Vol 188 (1) ◽  
pp. 638-640 ◽  
Author(s):  
G.R. Jahanshahloo ◽  
M. Soleimani-damaneh ◽  
A. Mostafaee
Keyword(s):  
Computational Complexity ◽  
Cost Efficiency ◽  
Efficiency Analysis ◽  
Analysis Models

Analyzing the Efficiency of County Road Production – Evidence from Eastern German Counties

2019 ◽  
Vol 20 (4) ◽  
pp. e415-e435
Author(s):  
Carolin Fritzsche
Keyword(s):  
Public Service ◽  
Local Governments ◽  
Efficiency Analysis ◽  
Data Envelopment ◽  
Government Services ◽  
The Road ◽  
Data Limitations ◽  
Using Data ◽  
Unique Dataset

AbstractThis study analyzes the efficiency of the road production by local governments using data envelopment analysis. The production of roads is a costly public service, which makes an efficiency analysis in this field an interesting subject. I enhance the previous literature, first, by examining the differences in the efficiencies of eastern German counties while considering the deformation of the pavement and foundation of roads, which previous studies have not included due to data limitations. Second, I use a unique dataset on road quality for my efficiency analysis and show that the efficiency levels differ from those in studies that apply proxies, such as the number of accidents, to capture the quality of roads. These findings indicate that there is a great need to develop reliable variables to describe government services. Additionally, I show that the correlations between efficiency levels and county characteristics vary greatly depending on the quality indicator used.

scholarly journals Efficiency Analysis of Competing Tests for Finding Differentially Expressed Genes in Lung Adenocarcinoma

2008 ◽  
Vol 6 ◽  
pp. CIN.S791 ◽  
Author(s):  
Rick Jordan ◽  
Satish Patel ◽  
Hai Hu ◽  
James Lyons-Weiler
Keyword(s):  
Lung Adenocarcinoma ◽  
Differentially Expressed Genes ◽  
Efficiency Analysis ◽  
Differentially Expressed ◽  
Classification Error ◽  
Sample Classification ◽  
Expression Of Genes ◽  
Using Data ◽  
Intuitive Method ◽  
Transformation Methods

In this study, we introduce and use Efficiency Analysis to compare differences in the apparent internal and external consistency of competing normalization methods and tests for identifying differentially expressed genes. Using publicly available data, two lung adenocarcinoma datasets were analyzed using caGEDA ( http://www.bioinformatics2.pitt.edu/GE2/GEDA.html ) to measure the degree of differential expression of genes existing between two populations. The datasets were randomly split into at least two subsets, each analyzed for differentially expressed genes between the two sample groups, and the gene lists compared for overlapping genes. Efficiency Analysis is an intuitive method that compares the differences in the percentage of overlap of genes from two or more data subsets, found by the same test over a range of testing methods. Tests that yield consistent gene lists across independently analyzed splits are preferred to those that yield less consistent inferences. For example, a method that exhibits 50% overlap in the 100 top genes from two studies should be preferred to a method that exhibits 5% overlap in the top 100 genes. The same procedure was performed using all available normalization and transformation methods that are available through caGEDA. The ‘best’ test was then further evaluated using internal cross-validation to estimate generalizable sample classification errors using a Naïve Bayes classification algorithm. A novel test, termed D1 (a derivative of the J5 test) was found to be the most consistent, and to exhibit the lowest overall classification error, and highest sensitivity and specificity. The D1 test relaxes the assumption that few genes are differentially expressed. Efficiency Analysis can be misleading if the tests exhibit a bias in any particular dimension (e.g. expression intensity); we therefore explored intensity-scaled and segmented J5 tests using data in which all genes are scaled to share the same intensity distribution range. Efficiency Analysis correctly predicted the ‘best’ test and normalization method using the Beer dataset and also performed well with the Bhattacharjee dataset based on both efficiency and classification accuracy criteria.

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