Works (31)

Updated: July 5th, 2023 15:32

2018 journal article

A contingency table approach based on nearest neighbour relations for testing self and mixed correspondence

SORT-STATISTICS AND OPERATIONS RESEARCH TRANSACTIONS, 42(2), 125–157.

By: E. Ceyhan

author keywords: Association; complete spatial randomness; habitat/niche specificity; independence; random labelling; segregation
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science)
Source: Web Of Science
Added: January 14, 2019

2017 journal article

Cell-specific and post-hoc spatial clustering tests based on nearest neighbor contingency tables

Journal of the Korean Statistical Society, 46(2), 219–245.

By: E. Ceyhan*

author keywords: Association; Asymptotic distribution; Completely mapped data; Complete spatial randomness; Overall tests; Random labeling; Segregation
Source: Crossref
Added: December 8, 2020

2017 journal article

Nearest neighbor methods for testing reflexivity

Environmental and Ecological Statistics, 24(1), 69–108.

By: E. Ceyhan* & S. Bahadır*

author keywords: Association; Completely mapped data; Complete spatial randomness; Habitat/niche specificity; Independence; Random labeling; Segregation; Sparse sampling
Source: Crossref
Added: January 5, 2021

2016 journal article

Edge density of new graph types based on a random digraph family

Statistical Methodology, 33, 31–54.

By: E. Ceyhan*

author keywords: Arc density; Asymptotic normality; Central limit theorem; Delaunay tessellation and triangulation; Proximity catch digraph; Reflexivity; Underlying graph; U-statistic
TL;DR: It is demonstrated that edge density of these graphs is a U -statistic, hence obtain the asymptotic normality of it for data from any distribution that satisfies mild regulatory conditions and can be extended for application to data in higher dimensions. (via Semantic Scholar)
Source: Crossref
Added: January 5, 2021

2014 journal article

A new correlation coefficient for bivariate time-series data

Physica A: Statistical Mechanics and Its Applications, 414, 274–284.

By: O. Erdem*, E. Ceyhan* & Y. Varli*

author keywords: Cross-correlation; Pearson's correlation coefficient; DCCA; Stationarity; Non-stationary time series
Source: Crossref
Added: August 28, 2020

2014 journal article

Comparison of relative density of two random geometric digraph families in testing spatial clustering

TEST, 23(1), 100–134.

By: E. Ceyhan*

author keywords: Association; Complete spatial randomness; Delaunay triangulation; Pitman asymptotic efficiency; Proximity catch digraphs; Segregation; U-statistic
TL;DR: Comparisons of the performance of relative densities of two parameterized random geometric digraph families called proximity catch digraphs (PCDs) in testing bivariate spatial patterns demonstrate that in terms of empirical power, relative density of CS-PCD has better performance (which occurs for expansion parameter values larger than one) for the segregation alternative, while relativedensity of PE-PCDs has betterperformance for the association alternative. (via Semantic Scholar)
Source: Crossref
Added: January 5, 2021

2014 journal article

Poster #T228 REDUCED ANTERIOR CINGULATE GRAY MATTER VOLUME AND THICKNESS IN SUBJECTS WITH DEFICIT SCHIZOPHRENIA

Schizophrenia Research, 153, S370.

By: M. Suzuki, M. Takayanagi, J. Wentz, Y. Takayanagi, D. Schretlen, E. Ceyhan*, A. Sawa, P. Barta, T. Ratnanather, N. Cascella

Source: Crossref
Added: August 28, 2020

2014 journal article

Segregation indices for disease clustering

Statistics in Medicine, 33(10), 1662–1684.

By: E. Ceyhan*

author keywords: spatial clustering; overall test; empirical size; cell-specific tests; empirical power; nearest neighbor contingency table; random labeling; Cuzick-Edwards's tests
MeSH headings : Child; Cluster Analysis; Computer Simulation; Epidemiologic Methods; Humans; Leukemia / epidemiology; Liver Diseases / epidemiology; Models, Statistical; United Kingdom / epidemiology
TL;DR: This article proposes the use of two distance‐based segregation indices to test the significance of disease clustering among subjects whose locations are from a homogeneous or an inhomogeneous population and derives the asymptotic distributions of the segregation indices. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Crossref
Added: January 5, 2021

2014 journal article

Simulation and characterization of multi-class spatial patterns from stochastic point processes of randomness, clustering and regularity

Stochastic Environmental Research and Risk Assessment, 28(5), 1277–1306.

By: E. Ceyhan*

author keywords: Complete spatial randomness; Nearest neighbor contingency table; Random labeling; Relative abundance; Spatial clustering
TL;DR: This work proposes various parameterizations of the segregation and association alternatives, list some appealing properties of these patterns, and proposes three processes for the two-class association pattern. (via Semantic Scholar)
Source: Crossref
Added: January 5, 2021

2013 journal article

Exploratory and inferential methods for spatio-temporal analysis of residential fire clustering in urban areas

Fire Safety Journal, 58, 226–239.

By: E. Ceyhan*, K. Ertuğay* & Ş. Düzgün*

author keywords: Spatio-temporal fire distribution; Urban fire; Fire management; Diggle's D-Function; Fire distribution
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (OpenAlex)
Source: Crossref
Added: August 28, 2020

2013 journal article

Morphometry of superior temporal gyrus and planum temporale in schizophrenia and psychotic bipolar disorder

Schizophrenia Research, 150(2-3), 476–483.

By: J. Ratnanather*, C. Poynton*, D. Pisano*, B. Crocker*, E. Postell*, S. Cebron*, E. Ceyhan*, N. Honeycutt*, P. Mahon*, P. Barta*

author keywords: Laminar thickness; Superior temporal gyrus; Planum temporale; Schizophrenia; Bipolar disorder; Laterality
MeSH headings : Adult; Analysis of Variance; Bipolar Disorder / pathology; Brain Mapping; Female; Functional Laterality; Humans; Image Processing, Computer-Assisted; Magnetic Resonance Imaging; Male; Middle Aged; Schizophrenia / pathology; Sex Factors; Temporal Lobe / pathology
TL;DR: Morphometric analysis suggests that there may be gender and laterality effects on the size and shape of the PT in B PD and SCZ with reduced laterality in PT in subjects with SCZ but not in BPD, and the PT probably plays a more sensitive role than the STG in structural abnormalities seen in SCZ. (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

2013 journal article

Reduced anterior cingulate gray matter volume and thickness in subjects with deficit schizophrenia

Schizophrenia Research, 150(2-3), 484–490.

By: M. Takayanagi*, J. Wentz*, Y. Takayanagi*, D. Schretlen*, E. Ceyhan*, L. Wang*, M. Suzuki*, A. Sawa* ...

author keywords: Schizophrenia; Deficit schizophrenia; Cortical thickness; Anterior cingulate cortex
MeSH headings : Adult; Analysis of Variance; Apathy; Brain Mapping; Cognition Disorders / etiology; Cognition Disorders / pathology; Dominance, Cerebral; Female; Gyrus Cinguli / pathology; Humans; Imaging, Three-Dimensional; Magnetic Resonance Imaging; Male; Middle Aged; Schizophrenia / complications; Schizophrenia / pathology; Schizophrenic Psychology
TL;DR: The data suggest that qualitative, categorical differences in neuroanatomy may distinguish between deficit and non-deficit subtypes of schizophrenia. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Crossref
Added: August 28, 2020

2013 journal article

The comparison of parametric and nonparametric bootstrap methods for reference interval computation in small sample size groups

Accreditation and Quality Assurance, 18(1), 51–60.

By: A. Coskun*, E. Ceyhan*, T. Inal*, M. Serteser* & I. Unsal*

author keywords: Box-Cox transformation; Confidence interval; Nonparametric bootstrap; Parametric bootstrap; Percentile; Reference interval
TL;DR: This study considers both parametric and nonparametric bootstrap methods for estimating RIs and the associated confidence intervals (CIs) in small sample size groups for population-based reference interval (RI) estimation in newborns and preterm babies. (via Semantic Scholar)
Source: Crossref
Added: January 5, 2021

2012 journal article

Prediction and control of number of cells in microdroplets by stochastic modeling

Lab on a Chip, 12(22), 4884.

By: E. Ceyhan*, F. Xu*, U. Gurkan*, A. Emre*, E. Turali*, R. El Assal*, A. Acikgenc*, C. Wu*, U. Demirci*

MeSH headings : Animals; Cell Count; Cell Size; Mice; Microtechnology / methods; Models, Statistical; Stochastic Processes
TL;DR: The statistical and stochastic models introduced in this study are adaptable to various cell types and cell encapsulation technologies such as microfluidic and acoustic methods that require reliable control over number of cells per droplet provided that settings and interaction of the variables is similar. (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

2012 journal article

The distribution of the relative arc density of a family of interval catch digraph based on uniform data

Metrika, 75(6), 761–793.

By: E. Ceyhan*

author keywords: Class cover catch digraph; Intersection digraph; Proximity catch digraph; Proximity map; Random graph; U-statistics
Source: Crossref
Added: January 5, 2021

2011 journal article

Quantization and analysis of hippocampal morphometric changes due to dementia of Alzheimer type using metric distances based on large deformation diffeomorphic metric mapping

Computerized Medical Imaging and Graphics, 35(4), 275–293.

By: E. Ceyhan*, M. Beg*, C. Cerito˜glu*, L. Wang*, J. Morris*, J. Csernansky*, M. Miller*, J. Ratnanather*

author keywords: Computational anatomy; Hippocampus; Left-right asymmetry; Logistic discrimination; Morphometry; Repeated-measures ANOVA
MeSH headings : Aged; Algorithms; Alzheimer Disease / pathology; Analysis of Variance; Brain Mapping / methods; Case-Control Studies; Discriminant Analysis; Female; Hippocampus / pathology; Humans; Magnetic Resonance Imaging / methods; Male; Principal Component Analysis; Sensitivity and Specificity
TL;DR: It is shown that metric distances with respect to a template computed via LDDMM can be a powerful tool in detecting differences in shape, and how metric distances can serve as a discriminative tool using logistic regression. (via Semantic Scholar)
UN Sustainable Development Goal Categories
10. Reduced Inequalities (OpenAlex)
Source: Crossref
Added: January 5, 2021

2011 journal article

Spatial Clustering Tests Based on the Domination Number of a New Random Digraph Family

Communications in Statistics - Theory and Methods, 40(8), 1363–1395.

By: E. Ceyhan*

author keywords: Association; Complete spatial randomness; Consistency; Delaunay triangulation; Proximity catch digraph; Proximity map; Segregation
TL;DR: The domination number of a parametrized random digraph family called proportional-edge proximity catch digraphs (PCDs) has binomial distribution when size of one class is fixed while the size of the other tends to infinity and has asymptotic normality when sizes of both classes tend to infinity. (via Semantic Scholar)
UN Sustainable Development Goal Categories
10. Reduced Inequalities (OpenAlex)
Source: Crossref
Added: January 5, 2021

2011 journal article

Statistical Analysis of Cortical Morphometrics Using Pooled Distances Based on Labeled Cortical Distance Maps

Journal of Mathematical Imaging and Vision, 40(1), 20–35.

By: E. Ceyhan*, M. Hosakere*, T. Nishino*, J. Alexopoulos*, R. Todd*, K. Botteron*, M. Miller*, J. Ratnanather*

author keywords: Computational anatomy; Depression; Laminar cortical mantle; Morphometry; Ventral medial prefrontal cortex
TL;DR: It is demonstrated that the classical parametric tests are robust to the non-normality and within sample dependence of LCDM distances and nonparametric tests will be robust to within sample dependent distances. (via Semantic Scholar)
Source: Crossref
Added: January 5, 2021

2010 journal article

An Investigation of New Graph Invariants Related to the Domination Number of Random Proximity Catch Digraphs

Methodology and Computing in Applied Probability, 14(2), 299–334.

By: E. Ceyhan*

author keywords: Class cover catch digraph (CCCD); Class cover problem; Covering set; Delaunay triangulation; Minimum dominating set; Proportional-edge PCD; Proximity graph; Random graph
TL;DR: This work considers the cases in which the vertices of the PCDs come from uniform and non-uniform distributions in the region of interest and introduces some auxiliary tools for PCDs and graph invariants related to the domination number. (via Semantic Scholar)
Source: Crossref
Added: January 21, 2021

2010 journal article

Directional clustering tests based on nearest neighbour contingency tables

Journal of Nonparametric Statistics, 22(5), 599–616.

By: E. Ceyhan*

author keywords: association; clustering; complete spatial randomness; independence; random labelling; spatial pattern
Source: Crossref
Added: January 21, 2021

2010 journal article

Extension of one-dimensional proximity regions to higher dimensions

Computational Geometry, 43(9), 721–748.

By: E. Ceyhan*

author keywords: Class cover catch digraph (CCCD); Delaunay triangulation; Domination number; Proximity map; Proximity catch digraph; Random graph; Relative density; Triangle center
TL;DR: The distribution of graph invariants are provided and some appealing properties of the spherical proximity map in compact intervals on the real line are noted, thereby introducing the mechanism and guidelines for defining new proximity maps in higher dimensions. (via Semantic Scholar)
Source: Crossref
Added: January 21, 2021

2009 journal article

A Comparison of Analysis of Covariate-Adjusted Residuals and Analysis of Covariance

Communications in Statistics - Simulation and Computation, 38(10), 2019–2038.

By: E. Ceyhan* & C. Goad*

author keywords: Allometry; ANOVA; Clustering; Homogeneity of variances; Isometry; Kruskal-Wallis test; Linear models; Parallel lines model
TL;DR: It is demonstrated that the methods on covariate-adjusted residuals are only appropriate when the regression lines are parallel and covariate means are equal for all treatments, and ANCOVA method exhibits the appropriate level. (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

2009 journal article

Overall and pairwise segregation tests based on nearest neighbor contingency tables

Computational Statistics & Data Analysis, 53(8), 2786–2808.

By: E. Ceyhan*

TL;DR: It is shown that the new NNCT-tests have better performance in terms of Type I error and power estimates and the distributional properties of these tests are analyzed and finite sample performance of the tests are assessed by an extensive Monte Carlo simulation study. (via Semantic Scholar)
Source: Crossref
Added: January 21, 2021

2008 journal article

On the use of nearest neighbor contingency tables for testing spatial segregation

Environmental and Ecological Statistics, 17(3), 247–282.

By: E. Ceyhan*

author keywords: Association; Clustering; Completely mapped data; Complete spatial randomness; Edge correction; Random labeling; Spatial point pattern
Source: Crossref
Added: January 21, 2021

2008 journal article

Segmentation of arteries in MPRAGE images of the ventral medial prefrontal cortex

Computerized Medical Imaging and Graphics, 32(1), 36–43.

By: N. Penumetcha*, B. Jedynak*, M. Hosakere*, E. Ceyhan*, K. Botteron* & J. Ratnanather*

author keywords: fast marching methods; blood vessels; segmentation; callosomarginal artery; pericallosal artery
MeSH headings : Algorithms; Arteries / anatomy & histology; Humans; Image Enhancement / methods; Magnetic Resonance Imaging / methods; Numerical Analysis, Computer-Assisted; Pattern Recognition, Automated / methods; Prefrontal Cortex / blood supply; Subtraction Technique
TL;DR: A method for removing arteries that appear bright with intensities similar to white matter in Magnetized Prepared Rapid Gradient Echo images of the ventral medial prefrontal cortex is described and may be useful in masking vasculature in other cortical regions. (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

2008 journal article

The distribution of the domination number of class cover catch digraphs for non-uniform one-dimensional data

Discrete Mathematics, 308(23), 5376–5393.

By: E. Ceyhan*

author keywords: Class cover catch digraph; Domination number; Non-uniform distribution; Proximity map; Random digraph
TL;DR: This work investigates the distribution of the domination number of the CCCDs based on data from non-uniform X points on an interval with end points from Y and extends these calculations for multiple Y points on bounded intervals. (via Semantic Scholar)
Source: Crossref
Added: January 21, 2021

2007 journal article

A new family of random graphs for testing spatial segregation

Canadian Journal of Statistics, 35(1), 27–50.

By: E. Ceyhan*, C. Priebe* & D. Marchette*

author keywords: association; complete spatial randomness; Delaunay triangulation; proximity catch digraph; random graph; relative density; segregation
TL;DR: The authors address specifically the problem of testing complete spatial randomness against spatial patterns of segregation or association between two or more classes of points on the plane by using a particular type of parameterized random digraph called a proximity catch digraph (PCD), which is a U‐statistic when scaled properly. (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

2007 journal article

Hypotonic swelling of salicylate-treated cochlear outer hair cells

Hearing Research, 228(1-2), 95–104.

By: M. Zhi*, J. Ratnanather*, E. Ceyhan*, A. Popel* & W. Brownell*

author keywords: hydraulic conductivity; extracisternal space; subsurface cisterna
MeSH headings : Animals; Cell Membrane Permeability / drug effects; Cell Size / drug effects; Cells, Cultured; Guinea Pigs; Hair Cells, Auditory, Outer / drug effects; Hair Cells, Auditory, Outer / metabolism; Hypotonic Solutions / metabolism; Isotonic Solutions / metabolism; Ketoglutaric Acids / pharmacology; Models, Biological; Osmolar Concentration; Osmosis / drug effects; Sodium Chloride / metabolism; Sodium Salicylate / pharmacology; Water / metabolism
TL;DR: It is suggested that depolymerization of cytoskeletal proteins and/or glycogen may be responsible for the large volume increase in salicylate-treated OHCs as well as the different responses to different modes of application of the hypotonic solution. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Source: Crossref
Added: August 28, 2020

2006 journal article

Demonstration of vascular abnormalities compressing esophagus by MDCT: Special focus on dysphagia lusoria

European Journal of Radiology, 59(1), 82–87.

By: F. Alper*, M. Akgun*, M. Kantarci*, A. Eroglu*, E. Ceyhan*, O. Onbas*, C. Duran*, A. Okur*

author keywords: dysphagia lusoria; esophagus; MDCT
MeSH headings : Adolescent; Adult; Aged; Aorta, Thoracic / abnormalities; Aorta, Thoracic / diagnostic imaging; Deglutition Disorders / diagnostic imaging; Deglutition Disorders / etiology; Diverticulum / diagnostic imaging; Esophageal Stenosis / diagnostic imaging; Esophageal Stenosis / etiology; Esophagus / blood supply; Female; Humans; Male; Middle Aged; Radiographic Image Interpretation, Computer-Assisted; Retrospective Studies; Subclavian Artery / abnormalities; Subclavian Artery / diagnostic imaging; Tomography, X-Ray Computed / methods
TL;DR: MDCT angiography is a useful diagnostic tool for evaluation of patients with dysphagia, especially caused by a vascular abnormality, as there is no comprehensive study investigating the role of MDCT in such cases. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Crossref
Added: August 28, 2020

2006 journal article

Relative density of the random r-factor proximity catch digraph for testing spatial patterns of segregation and association

Computational Statistics & Data Analysis, 50(8), 1925–1964.

By: E. Ceyhan*, C. Priebe* & J. Wierman*

author keywords: random proximity graphs; delaunay triangulation; relative density; segregation; association
TL;DR: The relative arc density of the digraph is used as the summary statistic, providing an alternative to the domination number employed previously, and has the advantage of validity for data in any dimension. (via Semantic Scholar)
UN Sustainable Development Goal Categories
10. Reduced Inequalities (OpenAlex)
Source: Crossref
Added: August 28, 2020

2005 journal article

The use of domination number of a random proximity catch digraph for testing spatial patterns of segregation and association

Statistics & Probability Letters, 73(1), 37–50.

By: E. Ceyhan* & C. Priebe*

author keywords: random digraph; domination number; proximity map; spatial point pattern; segregation; association; Delaunay triangulation
UN Sustainable Development Goal Categories
10. Reduced Inequalities (OpenAlex)
Source: Crossref
Added: August 28, 2020

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