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Uncovering the Riffled Independence Structure of Rankings [article]

Jonathan Huang, Carlos Guestrin
2010 arXiv   pre-print
Within the context of ranking, riffled independence corresponds to ranking disjoint sets of objects independently, then interleaving those rankings.  ...  We identify a novel class of independence structures, called riffled independence, encompassing a more expressive family of distributions while retaining many of the properties necessary for performing  ...  ACKNOWLEDGEMENTS This work is supported in part by the ONR under MURI N000140710747, and the Young Investigator Program grant N00014-08-1-0752.  ... 
arXiv:1006.1328v1 fatcat:xphwmh4liffb5jdpfgbjshh4ye

Uncovering the riffled independence structure of ranked data

Jonathan Huang, Carlos Guestrin
2012 Electronic Journal of Statistics  
Within the context of ranking, riffled independence corresponds to ranking disjoint sets of objects independently, then interleaving those rankings.  ...  We identify a novel class of independence structures, called riffled independence, encompassing a more expressive family of distributions while retaining many of the properties necessary for performing  ...  Supplementary Material Uncovering the Riffled Independence Structure of Ranked Data: Supplementary Material (doi: 10.1214/12-EJS670SUPP; .pdf).  ... 
doi:10.1214/12-ejs670 fatcat:xo4ndwnwmbdxdia4sxghoc6cfu

Uncovering and Displaying the Coherent Groups of Rank Data by Exploratory Riffle Shuffling [article]

Vartan Choulakian, Jacques Allard
2021 arXiv   pre-print
Our main task is to uncover and display the structure of the observed rank data by an exploratory riffle shuffling procedure which sequentially decomposes the n voters into a finite number of coherent  ...  be seen in the structure of the contingency table of the first-order marginals constructed from the Borda scorings of the voters ; d) The first TCA factor scores of the items of a coherent cluster are  ...  [2] generalized the notion of independence of two subsets of items to riffled independence to uncover the structure of rank data.  ... 
arXiv:2101.08188v1 fatcat:sgpcfnk7l5gixpg3vidw3suppe

ENVIRONMENTAL AUDITING: Assessing Biotic Integrity of Streams: Effects of Scale in Measuring the Influence of Land Use/Cover and Habitat Structure on Fish and Macroinvertebrates

MARY LAMMERT, J. DAVID ALLAN
1999 Environmental Management  
land use and channel structure.  ...  Six 100-m reaches were sampled on each of three first-order warm-water tributaries of the River Raisin in southeastern Michigan.  ...  Land use/cover data were provided by the Michigan Department of Natural Resources under a cooperative agreement.  ... 
doi:10.1007/s002679900184 pmid:9852191 fatcat:5dgyfrpmiff3llrdi4rgptoksy

Aquatic versus Terrestrial Insects: Real or Presumed Differences in Population Dynamics?

Jill Lancaster, Barbara Downes
2018 Insects  
The study of insect populations is dominated by research on terrestrial insects. Are aquatic insect populations different or are they just presumed to be different?  ...  Few researchers are currently working on the dynamics of aquatic insect populations; there is scope for many more studies and potentially enlightening contrasts with terrestrial insects.  ...  [139] found that Baetis rhodani exiting riffles dropped out of the drift in pools and rarely reached the next riffle.  ... 
doi:10.3390/insects9040157 pmid:30388810 pmcid:PMC6315690 fatcat:f47x5ne6djd4hhtkomqsqew7zm

Longitudinal variation in fish prey utilization, trophic guilds, and indicator species along a large subtropical river, China

Sai Wang, Tuan-Tuan Wang, Jin-Peng Tang, Lin Wang, Yang Yang, Hsing-Juh Lin, Hao-Yen Chang, Xing-An Zhou, Xing Li, Ming Wang
2018 Ecology and Evolution  
Seventeen prey-oriented fish guilds that were clustered based on DC matrix determined the spatial variation in the fish trophic structure.  ...  We analyzed the stomach contents of 96 fish species along the subtropical East River in China and identified 8 prey items (29 subcategories).  ...  As presented, two seemingly independent environmental and trophic gradients emerged from the NMDS plots: (a) a longitudinal decrease in riffle areas, canopy cover, flow velocity, and DO, along with an  ... 
doi:10.1002/ece3.4577 pmid:30598749 pmcid:PMC6303697 fatcat:baqjkpjuzfbzpcqjte53cqnsyq

Hierarchical analysis of relationships between brook trout (Salvelinus fontinalis) density and stream habitat features

Julie Deschênes, Marco A Rodríguez
2007 Canadian Journal of Fisheries and Aquatic Sciences  
Accounting for contextual effects by use of hierarchical models can enhance our understanding of how habitat features influence fish densities at multiple spatial scales.  ...  Brook trout density and environmental variables were quantified at 600 stream sections distributed among 120 reaches and 22 streams in the Cascapedia River basin, Quebec, Canada.  ...  Financial support was provided by the Natural Sciences and Engineering Research Council of Canada, le Fonds Québécois de la recherche sur la nature et les technologies, la Société Cascapédia, le Centre  ... 
doi:10.1139/f07-053 fatcat:vqvsxfhzabbujbfyb7n43jrd5m

Looking through the Glass Ceiling: A Qualitative Study of STEM Women's Career Narratives

Mary J. Amon
2017 Frontiers in Psychology  
Moreover, the lack of rewards for these workplace activities was seen as limiting professional effectiveness.  ...  Although efforts have been directed toward the advancement of women in science, technology, engineering, and mathematics (STEM) positions, little research has directly examined women's perspectives and  ...  ACKNOWLEDGMENTS I would like to thank the individuals who participated in this research for sharing their experiences and perspectives. I would also like to thank Dr. Luis H.  ... 
doi:10.3389/fpsyg.2017.00236 pmid:28265251 pmcid:PMC5316527 fatcat:h3l77qk3a5hm3jltop4vjdkbgy

The Proteome Folding Project: Proteome-scale prediction of structure and function

K. Drew, P. Winters, G. L. Butterfoss, V. Berstis, K. Uplinger, J. Armstrong, M. Riffle, E. Schweighofer, B. Bovermann, D. R. Goodlett, T. N. Davis, D. Shasha (+2 others)
2011 Genome Research  
Accurate structure annotations give researchers a three-dimensional (3D) view of protein function at the molecular level that enables specific point-mutation analysis or the design of custom inhibitors  ...  The incompleteness of proteome structure and function annotation is a critical problem for biologists and, in particular, severely limits interpretation of high-throughput and next-generation experiments  ...  T.N.D. and M.R. and the development of the YRC were supported by NIH-P41-RR11823. D.R.G. and L.M. thank 5 U54 AI057141-03 and 1S10RR023044-01 for support.  ... 
doi:10.1101/gr.121475.111 pmid:21824995 pmcid:PMC3205581 fatcat:w4j3islopbhuxp4bjvs7gqy32q

Parallelism Isn't Perfect: Could Disease and Flooding Drive a Life-History Anomaly in Trinidadian Guppies?

Sarah W. Fitzpatrick, Julián Torres-Dowdall, David N. Reznick, Cameron K. Ghalambor, W. Chris Funk
2014 American Naturalist  
Dryad data: http://dx.doi.org/10.5061/dryad.88dj4. abstract: Nonparallel evolution, where independent populations occupy similar environments but show phenotypic differences, can uncover previously ignored  ...  We investigated a nonparallelism in the life-history strategy of a Trinidadian guppy population, a system famous for parallel adaptation to differences in predation risk.  ...  Here, we used the most general model structure for transition probability, the bestsupported model for capture probability and modeled ap- Note: Model structures ranked using Akaike Information Criteria  ... 
doi:10.1086/674611 pmid:24464202 fatcat:kmtf4kdtybghpcqeasrrifktka

Research in the Luquillo Experimental Forest Has Advanced Understanding of Tropical Forests and Resolved Management Issues [chapter]

Ariel E. Lugo, Tamara Heartsill Scalley
2014 USDA Forest Service Experimental Forests and Ranges  
Results from the LEF have demonstrated the high resistance and resilience of tropical forests and the success of plantings in the restoration of forest cover on degraded lands.  ...  Long-term research on the response of wet forests in the Luquillo Experimental Forest (LEF) to natural and anthropogenic disturbances yielded information useful for the management of these forests and  ...  Mildred Alayón edited the final draft of the paper and Gisel Reyes provided bibliographic support.  ... 
doi:10.1007/978-1-4614-1818-4_19 fatcat:s77jiwutd5e5npndka3pa55i2i

Sound the alarm: fraud in neuroscience

Stephen G Lisberger
2013 Cerebrum  
images, has led to a tenfold increase in the number of retractions over the past decade.  ...  The solutions are not easy, but reform and greater vigilance is needed.  ...  Laboratories can operate quite independent of the world around them.  ... 
pmid:23847713 pmcid:PMC3704310 fatcat:pf3nxh7xszeyffqsla4qooi5hu

Evaluating detectability of freshwater fish assemblages in tropical streams: Is hand-seining sufficient?

Amy E. Deacon, Rajindra Mahabir, Devan Inderlall, Indar W. Ramnarine, Anne E. Magurran
2017 Environmental Biology of Fishes  
Furthermore, the results of multivariate analyses investigating assemblage structure also differed significantly depending on whether they were based on hand-seined data alone, or a combination of hand-seining  ...  The addition of electrofishing increased the number of individuals caught threefold, and increased the biomass fivefold.  ...  Jones for constructing Fig. 1, Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which  ... 
doi:10.1007/s10641-017-0610-5 fatcat:ogoclfqmwjat5gcppk2oz6zama

Headwaters Fed by Subterranean Ice: Potential Climate Refugia for Mountain Stream Communities?

Lusha M. Tronstad, Scott Hotaling, J. Joseph Giersch, Oliver J. Wilmot, Debra S. Finn
2020 Western North American Naturalist  
In 2015-2016, we measured habitat characteristics and quantified macroinvertebrate community structure along 6 alpine streams in the Teton Range, Wyoming, USA.  ...  Near-term extirpations of macroinvertebrates are predicted for mountain streams worldwide as a warming climate drives the recession of high-elevation ice and snow.  ...  We ran NMS analyses independently on 2 data matrices: one including each of the upper and lower sites collected in 2015 only (n = 12 sites), and the other including only the upper sites (sampled in both  ... 
doi:10.3398/064.080.0311 fatcat:v26hekl6ojdlznbcxge5ot5uka

MODELING DIFFUSIVE SPREAD IN A HETEROGENEOUS POPULATION: A MOVEMENT STUDY WITH STREAM FISH

Garrick T. Skalski, James F. Gilliam
2000 Ecology  
A diffusion-advection model of bluehead chub movement, structured with two subgroups that dispersed at different rates ("fast fish" and "slow fish"), was parameterized and validated with the field data  ...  The movement distributions were generally leptokurtic, and two of the four species demonstrated some degree of upstream bias. There was little difference in movement among species or through time.  ...  Future work should uncover the relative influences of en-vironmental and genetic effects on movement behavior in terms of fitness.  ... 
doi:10.1890/0012-9658(2000)081[1685:mdsiah]2.0.co;2 fatcat:ymwtuejswvhh5ec7jcxvqwrgfa
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