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Understanding statistics

Paul M Evitts, Heather Starmer, Kristine Teets, Christen Montgomery, Lauren Calhoun, Allison Schulze, Jenna MacKenzie, Lauren Adams
Purpose: There is currently minimal information on the impact of dysphonia secondary to phonotrauma on listeners. Considering the high incidence of voice disorders with professional voice users, it is important to understand the impact of a dysphonic voice on their audiences. Methods: Ninety-one healthy listeners (39 men, 52 women; mean age = 23.62 years) were presented with speech stimuli from 5 healthy speakers and 5 speakers diagnosed with dysphonia secondary to phonotrauma...
October 25, 2016: American Journal of Speech-language Pathology
Wei Tang, Zhijun Liao, Quan Zou
MicroRNAs(miRNAs) often exert their oncogenic and tumor suppressor functions by suppressing protein-coding genes expressions in cancers and thus have a strong association with cancers' generation, development and metastasis. Through comprehensively understanding differentially expressed miRNAs (oncomiRNA) in tumor tissues, we can elucidate the underlying molecular mechanisms in tumorigenesis and develop novel strategies for cancer diagnosis and treatment. The differential expression of miRNAs can now be analyzed through numerous statistical significance tests based on different principles, which are also available in various R packages...
October 23, 2016: Oncotarget
Luca Antonio Dimuccio, Nelson Rodrigues, Felice Larocca, João Pratas, Ana Margarida Amado, Luís A E Batista de Carvalho
This study examines the geochemical and mineralogical variations in the ferruginous mineralisations that crop out within Grotta della Monaca, which is considered to be the most striking and best known example of a prehistoric iron mine-cave from the southern Apennines (Calabria, Italy). Previous archaeological research identified three local and distinct ancient exploitation phases of these ferruginous mineralisations: (1) an Upper Palaeolithic phase; (2) a Late Neolithic phase; and (3) a post-Medieval phase...
October 17, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Thanh Nguyen, Asim Bhatti, Samuel Yang, Saeid Nahavandi
This paper introduces an approach to classification of RNA-seq read counts using grey relational analysis (GRA) and Bayesian Gaussian process (GP) models. Read counts are transformed to microarray-like data to facilitate normal-based statistical methods. GRA is designed to select differentially expressed genes by integrating outcomes of five individual feature selection methods including two-sample t-test, entropy test, Bhattacharyya distance, Wilcoxon test and receiver operating characteristic curve. GRA performs as an aggregate filter method through combining advantages of the individual methods to produce significant feature subsets that are then fed into a nonparametric GP model for classification...
2016: PloS One
A Arias, O A Peters, I L Broyles
AIM: To develop, implement and evaluate an innovative curriculum in biostatistics in response to the needs of fostering critical thinking in graduate health care education for evidence-based practice and life-long learning education. METHODOLOGY: The curriculum was designed for first-year residents in a postgraduate endodontic program using a six-step approach to curriculum development to provide sufficient understanding to critically evaluate biomedical publications, to design the best research strategy to address a specific problem and to analyse data by appropriate statistical test selection...
October 26, 2016: International Endodontic Journal
Laurel Fogarty, Joe Yuichiro Wakano, Marcus W Feldman, Kenichi Aoki
The forces driving cultural accumulation in human populations, both modern and ancient, are hotly debated. Did genetic, demographic, or cognitive features of behaviorally modern humans (as opposed to, say, early modern humans or Neanderthals) allow culture to accumulate to its current, unprecedented levels of complexity? Theoretical explanations for patterns of accumulation often invoke demographic factors such as population size or density, whereas statistical analyses of variation in cultural complexity often point to the importance of environmental factors such as food stability, in determining cultural complexity...
October 25, 2016: Human Nature: An Interdisciplinary Biosocial Perspective
Loredana Marchica, Yaxi Zhao, Jeffrey Derevensky, William Ivoska
Fantasy sports is a growing industry with a reported 56.8 million individuals participating in the United States and Canada alone in 2015. Whereas this activity has attracted considerable public attention, little research has examined its impact on adolescents in spite of their high rates of gambling. The current study examined the relationship between regular participation (more than once a month) in sport-relevant gambling activities among adolescents and those identified as being at-risk for a gambling problem...
October 25, 2016: Journal of Gambling Studies
Pravech Ajawatanawong
Molecular phylogenetics is the study of evolutionary relationships among organisms using molecular sequence data. The aim of this review is to introduce the important terminology and general concepts of tree reconstruction to biologists who lack a strong background in the field of molecular evolution. Some modern phylogenetic programs are easy to use because of their user-friendly interfaces, but understanding the phylogenetic algorithms and substitution models, which are based on advanced statistics, is still important for the analysis and interpretation without a guide...
October 26, 2016: Advances in Biochemical Engineering/biotechnology
Michael Heit, Nayera Guirguis, Nadine Kassis, Michelle Takase-Sanchez, Janet Carpenter
OBJECTIVES: The purpose of this illustrative review is to provide guidance for the measurement of socioeconomic position when conducting health disparities research in urogynecology study populations. METHODS: Deidentified data were extracted from existing investigational review board-approved research databases for illustrative purposes. Attributes collected included the study participant's marital status, level of educational attainment (in number of years of school completed) and occupation as well as the study participant's last/only spouses' level of education and occupation...
October 25, 2016: Female Pelvic Medicine & Reconstructive Surgery
Roland Kjellander
Screened electrostatic interactions in ionic liquids are investigated by means of exact statistical mechanical analysis combined with physical arguments that enhance the transparency and conceptual accessibility of the analysis and results. The constituent ions and immersed particles in the liquid can have arbitrary shapes and any internal charge distributions. The decay of the screened electrostatic potential and the free energy of interaction in ionic liquids can be exponentially damped oscillatory (like in molten simple salts) as well as plain exponential and long-ranged (like in dilute electrolyte solutions)...
September 28, 2016: Journal of Chemical Physics
Saman Alavi, Ryo Ohmura
When compressed with water or ice under high pressure and low temperature conditions, some gases form solid gas hydrate inclusion compounds which have higher melting points than ice under those pressures. In this work, we study the balance of the guest-water and water-water interaction energies that lead to the formation of the clathrate hydrate phases. In particular, molecular dynamics simulations with accurate water potentials are used to study the energetics of the formation of structure I (sI) and II (sII) clathrate hydrates of methane, ethane, and propane...
October 21, 2016: Journal of Chemical Physics
Aleksandra Dimitrovska Cvetkovska, Stefano Manfredini, Paola Ziosi, Sonia Molesini, Valeria Dissette, Ilenia Magri, Chiara Scapoli, Alberto Carrieri, Elisa Durini, Silvia Vertuani
OBJECTIVE: The in vitro evaluation of SPF is still a problem due to the lack of repeatability and correlation between the in vitro and in vivo data and many authors are currently working to develop an internationally harmonized method.(1) Very recently, the use of several "adjuvant" ingredients such as boosters, antioxidants, immuno-modulators, solvents and film forming ingredients have further complicated the pattern for product developers, that should frequently run in vivo test. The aim of this study is to understand if a simple and cheap in vitro method could be optimized in order to provide both statistically repeatable and predictive SPF measurement...
October 26, 2016: International Journal of Cosmetic Science
Yu-Ming Shen, Lien D Le, Rory Wilson, Ulrich Mansmann
BACKGROUND: Biomarkers providing evidence for patient-treatment interaction are key in the development and practice of personalized medicine. Knowledge that a patient with a specific feature - as demonstrated through a biomarker - would have an advantage under a given treatment vs. a competing treatment can aid immensely in medical decision-making. Statistical strategies to establish evidence of continuous biomarkers are complex and their formal results are thus not easy to communicate...
October 26, 2016: Methods of Information in Medicine
B Knegt, T Potter, N A Pearson, Y Sato, H Staudacher, B C J Schimmel, E T Kiers, M Egas
When two related species interbreed, their hybrid offspring frequently suffer from reduced fitness. The genetics of hybrid incompatibility are described by the Bateson-Dobzhansky-Muller (BDM) model, where fitness is reduced by epistatic interactions between alleles of heterospecific origin. Unfortunately, most empirical evidence for the BDM model comes from a few well-studied model organisms, restricting our genetic understanding of hybrid incompatibilities to limited taxa. These systems are predominantly diploid and incompatibility is often complete, which complicates the detection of recessive allelic interactions and excludes the possibility to study viable or intermediate stages...
October 26, 2016: Heredity
Wendy J Adams, James H Elder, Erich W Graf, Julian Leyland, Arthur J Lugtigheid, Alexander Muryy
Recovering 3D scenes from 2D images is an under-constrained task; optimal estimation depends upon knowledge of the underlying scene statistics. Here we introduce the Southampton-York Natural Scenes dataset (SYNS:, which provides comprehensive scene statistics useful for understanding biological vision and for improving machine vision systems. In order to capture the diversity of environments that humans encounter, scenes were surveyed at random locations within 25 indoor and outdoor categories...
October 26, 2016: Scientific Reports
Roger Chou, Shelley Selph, David I Buckley, Rongwei Fu, Jessica C Griffin, Sara Grusing, John L Gore
PURPOSE: To systematically review the comparative effectiveness of fluorescent versus white light cystoscopy on bladder cancer clinical outcomes. METHODS: Systematic literature searches of Ovid MEDLINE (January 1990 through September 2015), Cochrane databases, and reference lists were performed. Fourteen randomized trials of fluorescent cystoscopy using 5-amimolevulinic acid (5-ALA) or hexaminolevulinic acid (HAL) versus white light cystoscopy for diagnosis of initial or recurrent bladder cancer that reported bladder cancer recurrence, progression, mortality, and harms were selected for review...
October 22, 2016: Journal of Urology
Oma N Agbai, Parastoo Davari, Jennifer Johnson, April Armstrong, Nasim Fazel
INTRODUCTION: Patient treatment satisfaction and adherence may be affected by the initial understanding of outcomes in the treatment of actinic keratoses with 5-fluorouracil 5% cream (5-FU). Pre-treatment educational videos may optimize this understanding. The objective of this study was to determine whether prospective patient viewing of an educational video delineating treatment effects and expectations improves patient satisfaction and treatment completion rates for the treatment of actinic keratoses with 5-FU...
October 24, 2016: Dermatology and Therapy
Michael V Hull, Andrew R Jagim, Jonathan M Oliver, Mike Greenwood, Deanna R Busteed, Margaret T Jones
BACKGROUND: Limited research exists on the effect of a sports dietitian (SD) on athletes' dietary habits and nutrient periodization, which is the deliberate manipulation of macronutrient intake to match training goals. Further, the difference in dietary habits between men and women collegiate athletes has been understudied. A survey questionnaire examining dietary habits and practices was administered to athletes at two universities that employed a full time SD. Not all athletes used the SD as their primary source for nutritional guidance...
2016: Journal of the International Society of Sports Nutrition
Andrew J Tatem, Peng Jia, Dariya Ordanovich, Michael Falkner, Zhuojie Huang, Rosalind Howes, Simon I Hay, Peter W Gething, David L Smith
BACKGROUND: Malaria remains a problem for many countries classified as malaria free through cases imported from endemic regions. Imported cases to non-endemic countries often result in delays in diagnosis, are expensive to treat, and can sometimes cause secondary local transmission. The movement of malaria in endemic countries has also contributed to the spread of drug resistance and threatens long-term eradication goals. Here we focused on quantifying the international movements of malaria to improve our understanding of these phenomena and facilitate the design of mitigation strategies...
October 21, 2016: Lancet Infectious Diseases
Tobias Bluhmki, Raphael Simon Peter, Kilian Rapp, Hans-Helmut König, Clemens Becker, Ivonne Lindlbauer, Dietrich Rothenbacher, Jan Beyersmann, Gisela Büchele
OBJECTIVES: Persons with osteoporotic fracture history are subject to an increased risk for subsequent fractures and mortality. The aim of this retrospective study was to investigate the impact of a previous osteoporotic low-impact (fragility) index fracture (eg, forearm, lower leg) on mortality of a subsequent femoral fracture. DESIGN: Retrospective cohort study. PARTICIPANTS/MEASUREMENTS: Claims data of a German health insurance agency including >1...
October 21, 2016: Journal of the American Medical Directors Association
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