Rotevatn, Elisabeth Ørskov Engan, Mette Stensaker, Emilie Hufthammer, Karl Ove Rygh, Lars Jørgen
Published in
Scandinavian Journal of Pain
Objectives Assessment of pain is challenging given its subjective nature. Standard pain assessment tools have limitations. We aimed to compare the verbal numeric rating scale (NRS) and Grasp, a novel handheld electronic device that reports pain by squeezing. Methods To compare Grasp and NRS, healthy adult volunteers were invited to undergo two subs...
Kokol-Bukovšek, Damjana Stopar, Nik
We determine the upper and lower bounds for possible values of Kendall's tau of a bivariate copula given that the value of its Spearman's footrule or Gini's gamma is known, and show that these bounds are always attained.
yeh;, chih-tung
Prognostic analysis for patient survival often employs gene expressions obtained from high-throughput screening for tumor tissues from patients. When dealing with survival data, a dependent censoring phenomenon arises, and thus the traditional Cox model may not correctly identify the effect of each gene. A copula-based gene selection model can effe...
Črne, Jan
Ko želimo kopule uporabiti za modeliranje diskretno porazdeljenih slučajnih vektorjev, naletimo na številne težave. Ena od njih je odsotnost enoličnosti, ki bo vodila v nejasnosti, s kakšnimi objekti imamo opravka. To težavo bomo kvantificirali preko vpeljave kopul spodnje in zgornje Carleyine meje ter njunih mer skladnosti in posebej preko funkcij...
Gebremariam, Meskerem Getachew Bacha, Reta Habtamu Demissie, Demeke Kifle Wolde, Kibrealem Sisay Dame, Kenenisa Tadesse Akessa, Geremew Muleta
Published in
Journal of Research in Health Sciences
Background: Glaucoma is a significant public health problem due to its substantial increase in the projected number of glaucoma cases. In Ethiopia, glaucoma accounts for 5.2% of irreversible blindness and is the fifth main cause of blindness. The main objective of this study was to modeling time to blindness of left and right eyes of glaucoma patie...
Qian, Jing Chiou, Sy Han Betensky, Rebecca A.
Published in
Journal of the Royal Statistical Society. Series C, Applied statistics
Truncated survival data arise when the event time is observed only if it falls within a subject specific region. The conventional risk-set adjusted Kaplan–Meier estimator or Cox model can be used for estimation of the event time distribution or regression coefficient. However, the validity of these approaches relies on the assumption of quasi-indep...
Hunsberger, Sally Long, Lori Reese, Sarah E. Hong, Gloria H. Myles, Ian A. Zerbe, Christa S. Chetchotisakd, Pleonchan Shih, Joanna H.
Published in
Statistica Neerlandica
This paper develops methods to test for associations between two variables with clustered data using a U -Statistic approach with a second-order approximation to the variance of the parameter estimate for the test statistic. The tests that are presented are for clustered versions of: Pearsons χ 2 test, the Spearman rank correlation and Kendall’s τ ...
Bokhari, Mohammad Ubaidullah Adhami, Mohd. Kashif Ahmad, Afaq
Published in
Operations Research Forum
News search engines are the exclusive search services for users’ news intake. Providing relevant query to a news search engine, the user gets back a single news result page consisting of various news articles aggregated from thousands of online news sources available on the World Wide Web. The availability and use of major news search engines like ...
Langworthy, Benjamin W Stephens, Rebecca L Gilmore, John H Fine, Jason P
Published in
Journal of multivariate analysis
Canonical correlation analysis (CCA) is a common method used to estimate the associations between two different sets of variables by maximizing the Pearson correlation between linear combinations of the two sets of variables. We propose a version of CCA for transelliptical distributions with an elliptical copula using pairwise Kendall's tau to esti...
Yoon, Grace Müller, Christian L Gaynanova, Irina
Published in
Journal of computational and graphical statistics : a joint publication of American Statistical Association, Institute of Mathematical Statistics, Interface Foundation of North America
Latent Gaussian copula models provide a powerful means to perform multi-view data integration since these models can seamlessly express dependencies between mixed variable types (binary, continuous, zero-inflated) via latent Gaussian correlations. The estimation of these latent correlations, however, comes at considerable computational cost, having...
