Les méthodes de classification non supervisées appliquées aux textes : mesure de la performance des résultats de clustering de documents

2013 ◽  
Author(s):  
Pascal Cuxac ◽  
Jean-Charles Lamirel ◽  
Maha Ghribi
Keyword(s):  
Text Classification ◽  
Experimental Comparison ◽  
Alternative Approach ◽  
Bibliographic Data ◽  
F Measure

Nous présentons une approche alternative pour l'évaluation de la qualité de classifications non supervisées de textes basée sur des critères de rappel, précision et F-mesure non supervisés, exploitant les descripteurs associées aux classes. La comparaison expérimentale du comportement des critères classiques avec notre approche est effectuée sur des données bibliographiques.This paper presents an alternative approach to measuring the quality of non-supervised text classification based on the recall, precision and non-supervised F-measure criteria, using class descriptors. The experimental comparison of classical criteria behaviour to our approach is based on bibliographic data.

scholarly journals Reducing the Deterioration of Sentiment Analysis Results Due to the Time Impact

Information ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 184 ◽  
Author(s):  
Yuliya Rubtsova
Keyword(s):  
Computational Complexity ◽  
Text Classification ◽  
Feature Space ◽  
Sentiment Classification ◽  
Text Collections ◽  
Word Representation ◽  
F Measure ◽  
Over Time

The research identifies and substantiates the problem of quality deterioration in the sentiment classification of text collections identical in composition and characteristics, but staggered over time. It is shown that the quality of sentiment classification can drop up to 15% in terms of the F-measure over a year and a half. This paper presents three different approaches to improving text classification by sentiment in continuously-updated text collections in Russian: using a weighing scheme with linear computational complexity, adding lexicons of emotional vocabulary to the feature space and distributed word representation. All methods are compared, and it is shown which method is most applicable in certain cases. Experiments comparing the methods on sufficiently representative text collections are described. It is shown that suggested approaches could reduce the deterioration of sentiment classification results for collections staggered over time.

Animal Models and Alternatives in the Quality Control of Vaccines: Are In Vitro Methods or In Vivo Methods the Scientific Equivalent of the Emperor's New Clothes?

1995 ◽  
Vol 23 (1) ◽  
pp. 61-73
Author(s):  
Coenraad Hendriksen ◽  
Johan van der Gun
Keyword(s):  
Quality Control ◽  
Test Methods ◽  
In Vitro Test ◽  
Large Numbers ◽  
Alternative Approach ◽  
Inactivated Vaccines ◽  
Vitro Test

In the quality control of vaccine batches, the potency testing of inactivated vaccines is one of the areas requiring very large numbers of animals, which usually suffer significant distress as a result of the experimental procedures employed. This article deals with the potency testing of diphtheria and tetanus toxoids, two vaccines which are used extensively throughout the world. The relevance of the potency test prescribed by the European Pharmacopoeia monographs is questioned. The validity of the potency test as a model for the human response, the ability of the test to be standardised, and the relevance of the test in relation to the quality of the product are discussed. It is concluded that the potency test has only limited predictive value for the antitoxin responses to be expected in recipients of these toxoids. An alternative approach for estimating the potency of toxoid batches is discussed, in which a distinction is made between estimation of the immunogenic potency of the first few batches obtained from a seed lot and monitoring the consistency of the quality of subsequent batches. The use of animals is limited to the first few batches. Monitoring the consistency of the quality of subsequent batches is based on in vitro test methods. Factors which hamper the introduction and acceptance of the alternative approach are considered. Finally, proposals are made for replacement, reduction and/or refinement (the Three Rs) in the use of animals in the routine potency testing of toxoids.

scholarly journals An Alternative Approach to the Terminal Management of Ogilvie Syndrome

2017 ◽  
Vol 11 (2) ◽  
pp. 352-358
Author(s):  
Daniel Galban ◽  
Joshua J. Baiel
Keyword(s):  
Quality Of Life ◽  
Surgical Resection ◽  
Medical Therapy ◽  
Subtotal Colectomy ◽  
Abdominal Discomfort ◽  
Conservative Approach ◽  
Replacement Surgery ◽  
Alternative Approach ◽  
Ogilvie Syndrome

Ogilvie syndrome is defined as colonic pseudo-obstruction due to nonmechanical causes. Mortality of nearly 50% is associated with perforation of the distended, pseudo-obstructed colon. While conservative medical therapy has proven to be beneficial in a majority of cases, >3% of patients have significant distention or perforation of the colon that warrants surgical resection. The case of a 48-year-old male with progressive abdominal discomfort and distention 12 days following knee replacement surgery is presented. He was subsequently diagnosed with colonic pseudo-obstruction and definitively treated with subtotal colectomy and colostomy. We propose that a more conservative approach to treatment of colonic pseudo-obstruction may prevent the need for colostomy, significantly improving quality of life.

scholarly journals Number of Clusters and the Quality of Hybrid Predictive Models in Analytical CRM

2014 ◽  
Vol 37 (1) ◽  
pp. 141-157 ◽  
Author(s):  
Mariusz Łapczyński ◽  
Bartłomiej Jefmański
Keyword(s):  
Predictive Models ◽  
Cluster Validity ◽  
Number Of Clusters ◽  
Model Combining ◽  
Cluster Validity Indices ◽  
Validity Indices ◽  
And Cluster Analysis ◽  
Analytical Tools ◽  
F Measure

Abstract Making more accurate marketing decisions by managers requires building effective predictive models. Typically, these models specify the probability of customer belonging to a particular category, group or segment. The analytical CRM categories refer to customers interested in starting cooperation with the company (acquisition models), customers who purchase additional products (cross- and up-sell models) or customers intending to resign from the cooperation (churn models). During building predictive models researchers use analytical tools from various disciplines with an emphasis on their best performance. This article attempts to build a hybrid predictive model combining decision trees (C&RT algorithm) and cluster analysis (k-means). During experiments five different cluster validity indices and eight datasets were used. The performance of models was evaluated by using popular measures such as: accuracy, precision, recall, G-mean, F-measure and lift in the first and in the second decile. The authors tried to find a connection between the number of clusters and models' quality.

scholarly journals Virology research in a Latin American developing country: a bibliometric analysis of virology in Colombia (2000–2013)

2015 ◽  
Vol 9 (11) ◽  
pp. 1226-1237 ◽  
Author(s):  
Julian Ruiz-Saenz ◽  
Marlen Martinez-Gutierrez
Keyword(s):  
Bibliometric Analysis ◽  
Latin American ◽  
Health Planning ◽  
The United States ◽  
Descriptive Statistics ◽  
Viral Diseases ◽  
Bibliographic Data ◽  
Latin American Countries ◽  
Scimago Journal Rank

Introduction: Bibliometric analysis demonstrates that the virology research in Latin America has increased. For this reason, the objective of this study was to evaluate Colombian publications on viruses and viral diseases in indexed journals during the period from 2000 to 2013. Methodology: The bibliographic data were collected from MedLine, SciELO, LILACS and Scopus databases. The database was constructed in Excel descriptive statistics. The SCImago Journal Rank (SJR) was evaluated using the SCImago Journal & Country Rank in 2013 and was used as an indicator of the quality of the journals used by the Colombian researchers. Results: The total number of papers published was 711, of which 40.4% were published in local journals, and 59.6% were published in foreign journals. Most (89.2%) were original papers. Moreover, 34.2% of the papers were published in collaboration with international researchers, with the United States being the most represented. Of the journals used, 85.6% had an SJR, and 14.4% did not. The median SJR of the papers was 0.789, and the median of the papers with international collaborators was higher compared to the SJR of the papers without international collaboration. Papers were most frequently published in journals whose categories were medicine (miscellaneous), virology, and infectious diseases. The viruses that appeared in the papers more frequently were HIV, dengue, and papillomavirus. Conclusions: This study provides data for use in research, health planning, and policy analysis as it relates to virology in Colombia and other developing Latin American countries.

scholarly journals Self vs. other, child vs. adult. An experimental comparison of valuation perspectives for valuation of EQ-5D-Y-3L health states

2021 ◽  
Author(s):  
S. A. Lipman ◽  
V. T. Reckers-Droog ◽  
M. Karimi ◽  
M. Jakubczyk ◽  
A. E. Attema
Keyword(s):  
Child Health ◽  
Visual Analogue Scale ◽  
Analogue Scale ◽  
Experimental Comparison ◽  
Adult Health ◽  
Health States ◽  
Trade Off ◽  
Considerable Heterogeneity

Abstract Objectives EQ-5D-Y-3L health states are valued by adults taking the perspective of a 10-year-old child. Compared to valuation of adult EQ-5D instruments, this entails two changes to the perspective: (i) child health states are valued instead of adult health states and: (ii) health states are valued for someone else instead of for oneself. Although earlier work has shown that these combined changes yield different values for child and adult health states that are otherwise equal, it currently remains unclear why. Hence, we aimed to disentangle the effects of both changes. Methods A sample of 205 students (mean age: 19.48) was surveyed. Each respondent completed visual analogue scale (VAS) and time trade-off (TTO) tasks for five EQ-5D-Y-3L states, using four randomly ordered perspectives: (i) self-adult (themselves), (ii) other-adult (someone their age), (iii) self-child (themselves as a 10-year-old), (iv) other-child (a child of 10 years old). We compared how each perspective impacted outcomes, precision and quality of EQ-5D-Y-3L valuation. Results Overall, differences between perspectives were consistent, with their direction being dependent on the health states and respondents. For VAS, the effect on outcomes of valuation depended on severity, but variance was higher in valuation with child perspectives. For TTO, we observed that EQ-5D-Y-3L states valued on behalf of others (i.e., children or adults) received higher valuations, but lower variances. Conclusion The use of a different perspective appears to yield systematic differences in EQ-5D-Y-3L valuation, with considerable heterogeneity between health states and respondents. This may explain mixed findings in earlier work.

Towards an HCI-Based Symbiotic Environment for Alzheimer's Support

2019 ◽  
pp. 14-42
Author(s):  
Leontios J. Hadjileontiadis ◽  
Dimitrios Mandiliotis ◽  
Konstantinos Toumpas ◽  
Aikaterini Kyprioti
Keyword(s):  
Quality Of Life ◽  
Life Expectancy ◽  
Social Inclusion ◽  
Innovative Design ◽  
Outdoor Activities ◽  
Global Epidemic ◽  
Alternative Approach ◽  
Ad Prevention ◽  
User Interfacing

Alzheimer's Disease (AD), being the most common form of dementia diagnosed in people over 65 years of age, is a global problem with dramatic impact, as there is no cure for it and worsens as it progresses, eventually leading to death. As the sufferer declines s/he often withdraws from family and society, leading to a marginalized way of living. Considering the life expectancy rise, a looming global epidemic of AD is foreseen; hence, new approaches need to be considered regarding AD prevention, diagnosis, treatment, and confrontation. In this vein, an alternative approach (namely Symbiosis) towards a symbiotic Human-Computer Interaction (HCI) environment is presented in this chapter, as a means to facilitate, understand and incorporate the needs of the whole AD community (i.e., patients, caregivers and doctors), involving cutting-edge technology, special serious games and natural-user interfacing, embedded within an innovative design framework. Overall, Symbiosis acts as a technology-based mediator for AD's indoor and outdoor activities, fostering their social inclusion and increasing their quality of life in a symbiotic context.

Reassessing the contents and context of governance in Asia: recognizing achievements

2019 ◽  
Vol 8 (4) ◽  
pp. 353-363 ◽  
Author(s):  
Ahmed Shafiqul Huque
Keyword(s):  
Good Governance ◽  
Primary Sources ◽  
Political Systems ◽  
Sources Of Information ◽  
Asian Countries ◽  
Content Type ◽  
Secondary Sources ◽  
Alternative Approach ◽  
Ranking Countries

Purpose Good governance has been declared as the key target of most Asian governments, but it appears to be an unattainable objective. The purpose of this paper is to explore the potentials for establishing governance across Asian countries. Drawing upon the literature and experience of Asian countries, the study argues that governance represents an unclear state that is rooted more in perception than reality. An extensive review of the indicators of governance reveals the anomaly and unorganized efforts to measure it, and points to the need for recognizing accomplishments in areas that are not directly or indirectly covered in the existing schemes of assessment. Design/methodology/approach The paper is based on a broad review of the literature on governance and political systems in Asian countries. Existing arrangements for assessing governance are critically reviewed to point out the risks in a perception-dependent approach. Secondary sources and insight obtained from relevant research constitute the data analyzed in the paper. Findings The paper finds that the target of good governance cannot be fully achieved due to the significant diversity across Asian countries as well as varied perceptions held by assessors. Stakeholders have different perceptions about the requirements and ideal of governance and existing tools for measuring governance are inadequate. Most importantly, assessment frameworks do not recognize contextual dimensions that are relevant to Asian countries. Furthermore, it is important to recognize efforts that are aimed at improving conditions instead of working toward an absolute outcome of governance. Recognition of small successes will contribute to the improvement of circumstances rather than ranking countries on the basis of a limited number of perception-based indicators and listing them on international indices. Research limitations/implications The paper does not draw upon primary sources of information and is limited to an assessment of existing arrangements. Practical implications The paper will help draw attention to the limitations of existing arrangements of assessing countries and ranking them for the quality of governance. It will also encourage researchers to think about alternative tools for assessing governance and recognizing progress in Asian countries. Social implications The paper will encourage governments to identify obstacles to good governance and adopt policies to overcome them. Originality/value The paper contributes to the literature presenting a critical view for encouraging alternative approach to governance, incorporating perceptions of diverse stakeholders and highlights the need to recognize progress, however limited, in all areas.

Sign in / Sign up

Export Citation Format

Share Document