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The Magic Barrier of Recommender Systems – No Magic, Just Ratings [chapter]

Alejandro Bellogín, Alan Said, Arjen P. de Vries
2014 Lecture Notes in Computer Science  
More specifically, our results show that our definition of coherence is correlated with the so-called magic barrier of recommender systems, and thus, it could be used to discriminate between easy users  ...  In this work, we analyse how the consistency of user ratings (coherence) may predict the performance of recommendation methods.  ...  Acknowledgments This work was carried out during the tenure of an ERCIM "Alain Bensoussan" Fellowship Programme.  ... 
doi:10.1007/978-3-319-08786-3_3 fatcat:fosjcf2h35frlejohbjlixao64

Coherence and inconsistencies in rating behavior: estimating the magic barrier of recommender systems

Alan Said, Alejandro Bellogín
2018 User modeling and user-adapted interaction  
Furthermore, we propose a measure of the consistency of user ratings (rating coherence) that predicts the performance of recommendation methods.  ...  This difference in user behavior can have a profound impact on the performance of the recommender system.  ...  This research was in part supported by the Spanish Ministry of Economy, Industry and Competitiveness (TIN2016-80630-P).  ... 
doi:10.1007/s11257-018-9202-0 fatcat:muwqz27on5cx7l3bv5bozanpuq

The Magic Barrier Revisited: Accessing Natural Limitations of Recommender Assessment [article]

Kevin Jasberg, Sergej Sizov
2017 arXiv   pre-print
In this article, we will extend the existing theory of the Magic Barrier into a new probabilistic but a yet pragmatic model.  ...  Recommender systems nowadays have many applications and are of great economic benefit.  ...  Accordingly, this complicates the evaluation of recommender systems, since it is not clear whether the di erence between a given rating and the prediction is induced by the system or just a ma er of Human  ... 
arXiv:1704.05841v1 fatcat:o3rizjufifcirivkn7rns7axwi

Dealing with Uncertainties in User Feedback: Strategies Between Denying and Accepting [article]

Kevin Jasberg, Sergej Sizov
2018 arXiv   pre-print
errors, systematic biases to accuracy metrics as well as its natural offset (the magic barrier).  ...  In doing so, we consider human uncertainty within a purely probabilistic framework and utilise hypothesis testing as well as a generalisation of the magic barrier to compare the effects of recently proposed  ...  However, Fig. 2d reveals, that both scores can be located within the con dence interval of a shi ed magic barrier.  ... 
arXiv:1802.05895v1 fatcat:ai5r7t7ipngoplhx2cwsjgkyki

Critique on Natural Noise in Recommender Systems

Wissam Al Jurdi, Jacques Bou Abdo, Jacques Demerjian, Abdallah Makhoul
2021 ACM Transactions on Knowledge Discovery from Data  
It is typical that the quality of the data that fuel those systems should be extremely reliable.  ...  Recommender systems have been upgraded, tested, and applied in many, often incomparable ways.  ...  The results of the experiment show that the recommender system of MoviePilot can be better enhanced since the Accuracy Barrier yielded a value of 0.61 (close to the numerical step of the rating scale of  ... 
doi:10.1145/3447780 fatcat:p5rqykym5fba5kqw22tybevqlm

Identifying mechanisms of change in a magic-themed hand-arm bimanual intensive therapy programme for children with unilateral spastic cerebral palsy: a qualitative study using behaviour change theory

Daisy Fancourt, Jaeyoung Wee, Fabianna Lorencatto
2020 BMC Pediatrics  
Very few barriers were raised; those that were raised were of relatively low frequency of reporting.  ...  One researched intervention is the Breathe Magic programme, which follows the protocol of hand-arm bimanual intensive therapy (HABIT) whilst, incorporating magic tricks to develop children's motor skills  ...  Acknowledgements The authors would like to acknowledge the staff, parents and young people involved in the Breathe Magic programme who took part in the research.  ... 
doi:10.1186/s12887-020-02246-y pmid:32736618 pmcid:PMC7394671 fatcat:43fbgubbizcoja6shuhus5mxdu

The pursuit of the magic pill: the overuse of psychotropic medications in children with intellectual and developmental disabilities in the USA

J. L. McLaren, J. D. Lichtenstein
2018 Epidemiology and Psychiatric Sciences  
Short-term use of psychotropic medications may be helpful in reducing the severity and frequency of challenging behaviours while evidence-based behavioural interventions are pursued.  ...  of antipsychotics.  ...  This research received no specific grant from any funding agency, commercial or not-for-profit sectors. Conflict of interest. None. Ethical standards. Not applicable.  ... 
doi:10.1017/s2045796018000604 pmid:30353794 pmcid:PMC6999033 fatcat:6h4hl7j74nefhid4vfbl5frary

Trimethoprim resistance in Gram negative urinary pathogens

R W Lacey, R G Loker, J Cooke, R T Calvert
1985 BMJ (Clinical Research Edition)  
Dr Pocock wrote of the "magic" of the p 0 05 barrier.  ...  Evaluations of diagntostic systems. New York: Academic Press, 1982. 2 N EnglJ7 Med 1978 ;299:690.  ... 
doi:10.1136/bmj.290.6466.469-d fatcat:co6wy45lz5eztdsgbdxsx6rshq

Role of telemedicine and its implementation in Nepal

Krishna Subedi, Nuwadatta Subedi
2021 Journal of Gandaki Medical College  
No abstract  ...  System (HMIS) in 1993.  ...  Telemedicine has been one of the smart solutions to overcome such issues. 1 ough the usefulness of telemedicine has amplified just during the Corona Virus Disease 2019 (COVID-19 pandemic), it has a long  ... 
doi:10.3126/jgmcn.v14i2.41221 fatcat:uqsnelfpbzgyhomyxb7iynjlrq

Fetish Oath Taking in Nigerian Politics and Administration: Bane of Development

P. O. Oviasuyi, S. O. Ajagun, Lawrence Isiraoje
2011 Journal of Social Sciences  
Seven-point recommendations for the amelioration of the dilemma of development were articulated, and the article concludes that unless there is proper implementation of the posited recommendations, coupled  ...  This article is of the view that godfatherism and fetish oath taking through the use of juju, witchcraft and voodooism have negatively affected the development of Nigeria.  ...  Nigeria with its current rating as the 6 th producer of oil in the world, still imports refined crude oil with virtually no refinery working to capacity.  ... 
doi:10.1080/09718923.2011.11892920 fatcat:eqjqvxdnevhbbfl6wgdvr3mnba

"You Will"

Karla Saari Kitalong
2000 Journal of business and technical communication  
In recommending that technical communication teachers incorpo- rate media analysis into their classrooms, I envision the resulting ped- agogy to be based on Douglas Kellner’s notion of a “diagnostic cri  ...  JBTC / July 2000 World Wide Web a.k.a. www, or justthe Web”; a system for orga- nizing information on the Internet, using hypertext links.  ... 
doi:10.1177/105065190001400303 fatcat:fgmsne24yjbobizcclsqklgfhm

Enhancing the shopping experience through RFID in an actual retail store

Joan Melià-Seguí, Rafael Pous, Anna Carreras, Marc Morenza-Cinos, Raúl Parada, Zeinab Liaghat, Ramir De Porrata-Doria
2013 Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication - UbiComp '13 Adjunct  
) "horse gates" by hidden antennas, freeing the entrance to the store from intimidating barriers.  ...  There are two types of possible enhancements: increasing the efficiency of traditional processes, or offering new use cases at the store. RFID offers a great opportunity in both cases.  ...  Acknowledgements The authors would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the quality of the paper.  ... 
doi:10.1145/2494091.2496016 dblp:conf/huc/Melia-SeguiPCMPLP13 fatcat:pn2hpmoavff6hevj6ws66wlqbm

A Qualitative Study of Barriers to the Utilization of HIV Testing Services Among Rural African American Cocaine Users

Patricia B. Wright, Katharine E. Stewart, Geoffrey M. Curran, Brenda M. Booth
2013 Journal of Drug Issues  
This qualitative study is about barriers to the utilization of HIV testing as perceived by African Americans who have recently used cocaine and who live in the rural Delta region of Arkansas.  ...  of the community in developing programs and services.  ...  The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.  ... 
doi:10.1177/0022042613476260 pmid:24039279 pmcid:PMC3772639 fatcat:ofilpfovxrd43g5bhfylqjbxe4

Changes within the Electroencephalogram and Increase in Mental Concentration are related to Differences in Solubulisation and Composition of Different Q10-Formulations

Freye E, Strobel HP
2016 Natural Products Chemistry & Research  
Objective: Evaluate the efficacy of three different Q10 formulation (Greenspeed@, Gerimed ® , and Power Magic ® Q10) on changes in vigilance by as well as evaluating the error rate in the concentration  ...  Volunteers were given any one of the Q10 formulations in a double blind cross-over design. No drop-outs were registered as volunteers were eager to increase their state of vigilance.  ...  Otherwise no other source of support was used.  ... 
doi:10.4172/2339-6836.1000233 fatcat:vs52ycp4yrdvhkddtk3nljenoy

Changes within the Electroencephalogram and Increase in Mental Concentration are related to Differences in Solubulisation and Composition of Different Q10-Formulations

Freye E, Strobel HP
2016 Natural Products Chemistry & Research  
Objective: Evaluate the efficacy of three different Q10 formulation (Greenspeed@, Gerimed ® , and Power Magic ® Q10) on changes in vigilance by as well as evaluating the error rate in the concentration  ...  Volunteers were given any one of the Q10 formulations in a double blind cross-over design. No drop-outs were registered as volunteers were eager to increase their state of vigilance.  ...  Otherwise no other source of support was used.  ... 
doi:10.4172/2329-6836.1000233 fatcat:gkppd6porrcibhwkagrqfyaa4a
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