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Learning Multivariate Hawkes Processes at Scale [article]

Maximilian Nickel, Matthew Le
2020 arXiv   pre-print
Multivariate Hawkes Processes (MHPs) are an important class of temporal point processes that have enabled key advances in understanding and predicting social information systems.  ...  In combination with easily interpretable latent variables and influence structures, this allows us to analyze diffusion processes at previously unattainable scale.  ...  Conclusion In this work, we developed a new method for modeling diffusion processes at previously unattainable scale.  ... 
arXiv:2002.12501v1 fatcat:wejfmlqucnaqdhuib4bodqq5rq

Topic time series analysis of microblogs

Eric L. Lai, Daniel Moyer, Baichuan Yuan, Eric Fox, Blake Hunter, Andrea L. Bertozzi, P. Jeffrey Brantingham
2016 IMA Journal of Applied Mathematics  
topics over time as temporal or spatio-temporal Hawkes process with exponential trigger functions.  ...  One useful class of tools to deal with such problems are topic models, which attempt to recover latent groups of word associations from the text.  ...  Thanks to Yu-Han Chang, Rajiv Maheswaran and their group from USC's Information Science Institute for providing the Twitter data.  ... 
doi:10.1093/imamat/hxw025 fatcat:osxuxlbfcrgipgnkskoiccgg6e

Investment Decision Factors Influencing the Share Market Investors in Chennai City

Chandran M, Venkatragavan V
The multivariate statistical tools confirmatory factor analysis and linear multiple regression analysis are applied to validate the whole research.  ...  Hawkings (2007), published a paper that reveals the stages of the laboratory work process that extends from ordering to interpretation and action [7] .  ...  Instruments Personal information schedule 2. Rathus Assertiveness scale (Spencer A Rathus) . This is a standardized 30-item self-report six point Likert scale.  ... 
doi:10.6084/m9.figshare.20156960.v1 fatcat:xdayak62svfp3kwqeiox2x2bxu

Limits on Efficient Computation in the Physical World [article]

Scott Aaronson
2005 arXiv   pre-print
The problem is that if any row or column sum in the U (t) matrix is extremely small, then the (r, c)-scaling process will magnify tiny errors in the entries.  ...  Of particular interest to physicists will be Section 14.3, which relates our results to fundamental limits on information processing imposed by the holographic principle.  ...  For of the at most ε new units of flow from w 1 to v 1 that increasing c i * made available, ε 0 of them were "taken up" in maximizing f 0 , but the process of maximizing f 0 could have again increased  ... 
arXiv:quant-ph/0412143v2 fatcat:x6mjz4h4gzaszbfgbkshgm2v3u

Engineering User-Centric Smart Charging Systems

Julian Christoph Huber
The charging settings are entered via two sliders, with anchors at the SoC at arrival and the maximum SoC expressed in km.  ...  This test requires paired samples, chosen at random, and a variable on an interval or ordinal scale.  ... 
doi:10.5445/ir/1000122898 fatcat:4hm3cyzlsffz5m6g3lbn6q73bi

Modelling the Interactions between Information and Communication Technologies and Travel Behaviour

Jacek Pawlak, John Polak, David Gann, Aruna Sivakumar, Engineering And Physical Sciences Research Council
This is achieved by analysing repeated cross-sectional data using structural equation modelling, and interpreted with reference to the theory of diffusion of innovations. The [...]  ...  The growing capabilities and widespread proliferation of information and communication technologies (ICT) into virtually every aspect of lifestyle, combined with the continuing challenges faced by transport  ...  On the other hand, aversion to such uncertainty could enter the model via inherent travel utility term ( ).  ... 
doi:10.25560/24993 fatcat:o6ivz7feojdo7jih55lfb6gd3i

Simulations for gravitational lensing of 21 cm radiation at EoR and post-EoR redshifts

Dottorando Alessandro, Romeo Supervisore, Moscardini Lauro, Co-Supervisori, Benton Robert, Metcalf, Pourtsidou Alkistis, Coordinatore, Lauro Moscardini
different HI evolutionary models.  ...  We also implemented a simple de-noising iii iv ABSTRACT procedure in order to filter out the small-scale noise which is likely to strongly contaminate the estimated signal.  ...  Right panel: the conversion process of Lyn into Lyα via atomic cascades. Taken from Pritchard & Loeb (2012).  ... 

Mysteries of Universe Imprinted on Redshifts

Shadab Alam
Even in a foreign land, though with a shared desire to learn physics, the CMU community made me feel at home.  ...  One of the very valuable thing in my experience of working with her has been the amount of freedom she provided and the highly interacting working group she has nurtured at CMU.  ...  Spergel for information on the specifications for Advanced ACTPol, as well as C. Hirata for redshift information for the Euclid photometric survey. AP was supported by a  ... 
doi:10.1184/r1/6720794 fatcat:rqkprctq2zdkppqrvkgvfhrjnq

Legibility of Musical Scores and Parallels with Language Reading

Vidar Arild Stenberg, Apollo-University Of Cambridge Repository, Apollo-University Of Cambridge Repository, Ian Cross
Cultural studies of reading —particularly the works of Saenger— point in the same direction; according to these, the change in Medieval textual scripts from scriptura continua at the beginning of the eight  ...  on music sight-reading (although lacking in systematic research based on objective measurements of legibility of texts) has proposed, based on surveys and studies of expertise, a series of cognitive models  ...  Following up on this intended quest, Laberge and Samuels [1974] put forwards a (highly influential and referenced) model of information processing in reading, in which visual information is transformed  ... 
doi:10.17863/cam.41100 fatcat:dwle6yktd5bmfn7gqux64ppicq

Fourth World Nation: A Critical Geography of Decline

Olon Frederick Dotson
We march because in memory of our butchered dead, the massacre of the honest toilers who were removing the reproach of laziness and thriftlessness hurled at the entire race.  ...  "With the money you plan to set aside for this proposed great plant, and with the talent you have at your command, you can make it a model plant, and a model plant ought to have a model city nearby for  ...  In other words, categorical ethnic distinctions do not depend on an absence of mobility, contact and information, but do entail social processes of exclusion and incorporation whereby discrete discusses  ... 
doi:10.25394/pgs.8321324 fatcat:la43t2ay75g6pbp22jm7yyuahi

'Lifestyle', heart disease, and the British public: c.1950 to c.2000

PM Clark
Such epidemiological research was translated into the political and policy spheres via the consensus for prevention that developed in 1970s.  ...  This thesis looks at how and why 'lifestyle' (understood as diet, exercise and other health behaviours) became the primary focus of public health in post-war Britain.  ...  Morris had already outlined to his superiors at the MRC how sparsely populated he felt the field of coronary heart disease research was, and he underlined the point for a more public audience in a 1955  ... 
doi:10.17037/pubs.04654392 fatcat:svf4v7kdqne4rllg75bsprwngy