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Systematic Analysis of Cluster Similarity Indices: How to Validate Validation Measures [article]

Martijn Gösgens, Alexey Tikhonov, Liudmila Prokhorenkova
2021 arXiv   pre-print
for an extensive list of validation indices.  ...  Many cluster similarity indices are used to evaluate clustering algorithms, and choosing the best one for a particular task remains an open problem.  ...  Systematic Analysis of Cluster Similarity Indices: How to Validate Validation Measures The code is available at https://github.com/MartijnGosgens/validation_indices.  ... 
arXiv:1911.04773v7 fatcat:fiqtqwly7vhqzcsoapx33ioesm

Seizure Control as an Indicator of Therapeutic Usefulness

Samuel Wiebe
2000 Canadian Journal of Neurological Sciences  
in all patients, eg., at similar intervals, with similar depth, and by similar personnel.  ...  Validity is most threatened in retrospective, uncontrolled studies without systematic outcome assessment.  ...  As the NHS3 indicates current seizure severity, define the time frame: e.g. 1-3 months or time since the last clinic visit.  ... 
doi:10.1017/s0317167100000743 pmid:10830335 fatcat:mksxjgdly5gppltiah4vle4gly

On a preference-based instrumental variable approach in reducing unmeasured confounding-by-indication

Yun Li, Yoonseok Lee, Robert A. Wolfe, Hal Morgenstern, Jinyao Zhang, Friedrich K. Port, Bruce M. Robinson
2014 Statistics in Medicine  
The bias formula shows that when the cluster size is finite, the IV estimator is asymptotically biased; only when both the number of groups and cluster size go to infinity, the bias disappears.  ...  We then derive a closed-form expression of asymptotic bias of the two-stage generalized ordinary least squares estimator when the IVs are valid.  ...  Even when IV is valid, an important finding in our bias analysis is that the 2SGLS IV estimator is usually asymptotically biased when the number of clusters goes to infinity but the cluster size is finite  ... 
doi:10.1002/sim.6404 pmid:25546152 fatcat:y4z5yedp3zca7nb5p57fwetiry

Exploring the high-resolution mapping of gender-disaggregated development indicators

C. Bosco, V. Alegana, T. Bird, C. Pezzulo, L. Bengtsson, A. Sorichetta, J. Steele, G. Hornby, C. Ruktanonchai, N. Ruktanonchai, E. Wetter, A. J. Tatem
2017 Journal of the Royal Society Interface  
Results show the potential of the approach in producing high-resolution maps of key gender-disaggregated socio-economic indicators, with explained variance through cross-validation being as high as 74-  ...  of geolocated demographic and health surveys cluster data and geospatial covariates.  ...  Comparison of the results of ANN and BGS when used to model the same indicators shows they have similar performance.  ... 
doi:10.1098/rsif.2016.0825 pmid:28381641 pmcid:PMC5414904 fatcat:zf4gmtrwyfcpdoi4bi5cfbi5wy

Towards a global scientific brain: Indicators of researcher mobility using co-affiliation data [article]

Cassidy R. Sugimoto, Nicolas Robinson-Garcia, Rodrigo Costas
2016 arXiv   pre-print
This paper analyses the potential use of bibliometric data for mapping and applying network analysis to mobility flows.  ...  We reflect on the potential uses of bibliometric data to inform research policies with regard to scientific mobility.  ...  This algorithm clusters publications that belong to a single author based on a set of similar publication patterns (co-author network, address data, etc.).  ... 
arXiv:1609.06499v2 fatcat:gxg7jygqdvf5jivqa33cjonzii

Cosmological Distance Indicators

Sherry H. Suyu, Tzu-Ching Chang, Frédéric Courbin, Teppei Okumura
2018 Space Science Reviews  
The next years ahead will be exciting as various cosmological probes reach 1 assess the current tension in H_0 measurements that could indicate new physics.  ...  HI intensity mapping has great potential to map BAO distances at z 0.8 and beyond with precisions of a few percent.  ...  cluster was completely out of reach.  ... 
doi:10.1007/s11214-018-0524-3 fatcat:gwyz45bhargudbizrzfii4emcq

What to expect from dynamical modelling of cluster haloes II. Investigating dynamical state indicators with Random Forest [article]

Qingyang Li, Jiaxin Han, Wenting Wang, Weiguang Cui, Federico De Luca, Xiaohu Yang, Yanrui Zhou, Rui Shi
2022 arXiv   pre-print
Without a selection in DS, cluster halos have an asymmetric distribution in η, corresponding to an overall positive half-mass bias.  ...  We investigate the importances of various dynamical features in predicting the dynamical state (DS) of galaxy clusters, based on the Random Forest (RF) machine learning approach.  ...  no selection to dynamical states are made, dynamical modelling of cluster halos tend to be biased towards a higher mass at the tracer median radius.  ... 
arXiv:2203.15268v1 fatcat:6pk26rcvlncwtg3plq6dgcyp2u

Systematic review of the relationships between combinations of movement behaviours and health indicators in the early years (0-4 years)

Nicholas Kuzik, Veronica J. Poitras, Mark S. Tremblay, Eun-Young Lee, Stephen Hunter, Valerie Carson
2017 BMC Public Health  
It is unclear whether similar relationships exist in younger children.  ...  For each health indicator, quality of evidence was assessed by study design using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) framework.  ...  For observational studies, the risk of selection bias, performance bias, selective reporting bias, detection bias, attrition bias, and other biases (e.g., inadequate control for key confounders) were assessed  ... 
doi:10.1186/s12889-017-4851-1 pmid:29219071 pmcid:PMC5773877 fatcat:ea5stvzpizdm3eq6hg2vzhc3jy

Setting competitiveness indicators using BSC and ANP

Rocío Poveda-Bautista, Doris C. Baptista, Mónica García-Melón
2012 International Journal of Production Research  
The analysis of the value chain of companies with similar characteristics in the same sector helps to identify early indicators of competitiveness, which will then be prioritised to the implementation  ...  In this sense business analysis is based on the analysis of the company's value chain. 10 12 9 10 11 Augusto et al. (2006) say that in a highly competitive market the organisation must engage in a systematic  ... 
doi:10.1080/00207543.2012.657964 fatcat:au4oescyebet7dugtt3nad7bua

Bias Properties of Extragalactic Distance Indicators XII: Bias Effects of Slope Differences and Intrinsic Dispersion on Tully-Fisher Distances to Galaxy Clusters with Application to the Virgo Cluster [article]

Allan Sandage (The Observatories of the Carnegie Institution of Washington, Pasadena, CA, USA)
2007 arXiv   pre-print
The Teerikorpi incompleteness bias in the distance modulus of a galaxy cluster that is determined from incomplete data using the Tully-Fisher (TF) method is discussed differently than has been done in  ...  A toy cluster is made with zero intrinsic TF dispersion but with slopes that differ between the calibrators and the cluster data, showing the bias caused by incorrect slopes.  ...  their analysis of the bias (Tammann, Sandage, & Reindl 2007) , and by others cited therein.  ... 
arXiv:0712.2066v1 fatcat:4lsrwmdy3vcolkmo57szzrtguq

Against the Grain? Assessing Graduate Labour Market Trends in Germany Through a Task-Based Indicator of Graduate Jobs

Golo Henseke
2018 Social Indicators Research  
It is supplied in the appendix of this study. Despite the expansion of higher educational attainment between 1999 and 2012, my analysis indicates a rising excess demand for graduate labour.  ...  To do so, it deploys a new statistically derived indicator of graduate jobs, based on job skill requirements obtained from worker-reported task data in the German Employment Surveys 2006 and 2012.  ...  Neither the derived indicator nor the analysis are free from limitations. Although the approach classifies occupations at a low level of aggregation, skill levels may differ within occupations.  ... 
doi:10.1007/s11205-018-1839-x fatcat:7xkr4pevffbylk6ylzpkivjrw4

Halos of Spiral Galaxies. I. The Tip of the Red Giant Branch as a Distance Indicator

M. Mouhcine, H. C. Ferguson, R. M. Rich, T. M. Brown, T. E. Smith
2005 Astrophysical Journal  
In four galaxies, the red-giant branch is sufficiently well populated to measure the magnitude of the tip of the red-giant branch (TRGB), a well-known distance indicator.  ...  Using both the Sobel edge-detection technique and maximum-likelihood analysis to measure the I-band magnitude of the red giant branch tip, we determine distances to four nearby galaxies: NGC 253, NGC 4244  ...  the luminosity function model is valid in the case of maximum likelihood analysis, and the number of stars used to construct the luminosity function in the case of Sobel edge detection analysis.  ... 
doi:10.1086/468177 fatcat:qis5uun46bgvrg6bcg3mbyppca

A Universal Trend among Proteomes Indicates an Oily Last Common Ancestor

Ranjan V. Mannige, Charles L. Brooks, Eugene I. Shakhnovich, Nick Grishin
2012 PLoS Computational Biology  
This trend, obtained from simple considerations (free from sequence reconstruction methods), was corroborated by regression studies within homologous and orthologous protein clusters as well as phylogenetic  ...  While indicating an inherent irreversibility in molecular evolution, oil escape also serves as a rare and universal reaction-coordinate for evolution (reinforcing Darwin's principle of Common Descent),  ...  chapter = howcite), and is therefore not biased towards specific classification methods.  ... 
doi:10.1371/journal.pcbi.1002839 pmid:23300421 pmcid:PMC3531291 fatcat:7xzvjyu34vhq3em4n3rckmipzm

Emergy analysis and indicators of sustainable development applied to tourism in central Italy

Margherita Panzieri, Nadia Marchettini
2001 International Journal of Sustainable Development  
The purpose of this exploratory study was to determine the environmental friendliness of 1,000 respondents in Mauritius and establish consumer perceptions of green products.  ...  Looking at the future of green marketing in Mauritius, it examines the dynamic nature of ecologically conscious consumer behaviour.  ...  The writing of this paper was supported by the Research Assistant, Nitin Ramphul.  ... 
doi:10.1504/ijsd.2001.001553 fatcat:qeponw4onje77czupewbbdztsi

Absorption line indices in the UV

C. Maraston, L. Nieves Colmenárez, R. Bender, D. Thomas
2008 Astronomy and Astrophysics  
Based on the comparison with globular cluster data, we select a set of 11 indices blueward of the 2000 Angstrom rest-frame that allows to recover well the ages and the metallicities of the clusters.  ...  In order to select indices that can be used as age and/or metallicity indicators for distant galaxies and globular clusters, we compare the models to data of template globular clusters from the Magellanic  ...  C.M. is a Marie Curie Excellence Grant Team Leader and ackwnoledges grant MEXT-CT-2006-042754 of the European Community.  ... 
doi:10.1051/0004-6361:20066907 fatcat:vxtqvk7zo5bpdboqrfqors7dlm
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