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https://www.readbyqxmd.com/read/28239899/correlation-estimation-with-singly-truncated-bivariate-data
#1
Jongho Im, Eunyong Ahn, Namseon Beck, Jae Kwang Kim, Taesung Park
Correlation coefficient estimates are often attenuated for truncated samples in the sense that the estimates are biased towards zero. Motivated by real data collected in South Sudan, we consider correlation coefficient estimation with singly truncated bivariate data. By considering a linear regression model in which a truncated variable is used as an explanatory variable, a consistent estimator for the regression slope can be obtained from the ordinary least squares method. A consistent estimator of the correlation coefficient is then obtained by multiplying the regression slope estimator by the variance ratio of the two variables...
February 27, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28239609/application-of-taxonomic-modeling-to-microbiota-data-mining-for-detection-of-helminth-infection-in-global-populations
#2
Mahbaneh Eshaghzadeh Torbati, Makedonka Mitreva, Vanathi Gopalakrishnan
Human microbiome data from genomic sequencing technologies is fast accumulating, giving us insights into bacterial taxa that contribute to health and disease. The predictive modeling of such microbiota count data for the classification of human infection from parasitic worms, such as helminths, can help in the detection and management across global populations. Real-world datasets of microbiome experiments are typically sparse, containing hundreds of measurements for bacterial species, of which only a few are detected in the bio-specimens that are analyzed...
December 2016: Data (Basel)
https://www.readbyqxmd.com/read/28239433/domain-adaptation-with-conditional-transferable-components
#3
Mingming Gong, Kun Zhang, Tongliang Liu, Dacheng Tao, Clark Glymour, Bernhard Schölkopf
Domain adaptation arises in supervised learning when the training (source domain) and test (target domain) data have different distributions. Let X and Y denote the features and target, respectively, previous work on domain adaptation mainly considers the covariate shift situation where the distribution of the features P(X) changes across domains while the conditional distribution P(Y∣X) stays the same. To reduce domain discrepancy, recent methods try to find invariant components [Formula: see text] that have similar [Formula: see text] on different domains by explicitly minimizing a distribution discrepancy measure...
June 2016: JMLR Workshop and Conference Proceedings
https://www.readbyqxmd.com/read/28239346/parallel-steps-large-scale-stochastic-spatial-reaction-diffusion-simulation-with-high-performance-computers
#4
Weiliang Chen, Erik De Schutter
Stochastic, spatial reaction-diffusion simulations have been widely used in systems biology and computational neuroscience. However, the increasing scale and complexity of models and morphologies have exceeded the capacity of any serial implementation. This led to the development of parallel solutions that benefit from the boost in performance of modern supercomputers. In this paper, we describe an MPI-based, parallel operator-splitting implementation for stochastic spatial reaction-diffusion simulations with irregular tetrahedral meshes...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28238691/early-invasive-versus-initial-conservative-strategies-for-women-with-non-st-elevation-acute-coronary-syndromes-propensity-matched-analysis
#5
Islam Y Elgendy, Ahmed N Mahmoud, Hend Mansoor, Anthony A Bavry
BACKGROUND: Studies conducted largely in men have shown improved outcomes with an early invasive strategy with non-ST-elevation acute coronary syndrome. In contrast, data have been less conclusive in women, with some trials demonstrating potential harm. This study aims to assess if an early invasive strategy in women is associated with better outcomes in real world data. METHODS: Women admitted with a primary diagnosis of non-ST-elevation myocardial infarction or unstable angina were identified from the National Inpatient Sample years 2012-2013...
February 24, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28237635/prevent-dm-comparative-effectiveness-trial-of-lifestyle-intervention-and-metformin
#6
Matthew J O'Brien, Alberly Perez, Adam B Scanlan, Victor A Alos, Robert C Whitaker, Gary D Foster, Ronald T Ackermann, Jody D Ciolino, Carol Homko
INTRODUCTION: Although the Diabetes Prevention Program and other clinical trials demonstrated the efficacy of intensive lifestyle interventions (ILI) and metformin to prevent type 2 diabetes, no studies have tested their comparative effects in pragmatic settings. This study was designed to compare the real-world effectiveness of ILI, metformin, and standard care among Hispanic women (Latinas) with prediabetes. STUDY DESIGN: RCT. SETTING/PARTICIPANTS: Ninety-two Latinas, who had a mean hemoglobin A1c of 5...
February 22, 2017: American Journal of Preventive Medicine
https://www.readbyqxmd.com/read/28237204/using-multicriteria-approaches-to-assess-the-value-of-health-care
#7
Charles E Phelps, Guruprasad Madhavan
Practitioners of cost-utility analysis know that their models omit several important factors that often affect real-world decisions about health care options. Furthermore, cost-utility analyses typically reflect only single perspectives (e.g., individual, business, and societal), further limiting the value for those with different perspectives (patients, providers, payers, producers, and planners-the 5Ps). We discuss how models based on multicriteria analyses, which look at problems from many perspectives, can fill this void...
February 2017: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
https://www.readbyqxmd.com/read/28236480/effect-of-biodiesel-fuel-on-real-world-nonroad-heavy-duty-diesel-engine-particulate-matter-emissions-composition-and-cytotoxicity
#8
Nathan Martin, Melissa Lombard, Kirk R Jensen, Patrick Kelley, Tara Pratt, Nora Traviss
Biodiesel is regarded by many as a "greener" alternative fuel to petroleum diesel with potentially lower health risk. However, recent studies examining biodiesel particulate matter (PM) characteristics and health effects are contradictive, and typically utilize PM generated by passenger car engines in laboratory settings. There is a critical need to analyze diesel and biodiesel PM generated in a "real-world" setting where heavy duty-diesel (HDD) engines and commercially purchased fuel are utilized. This study compares the mass concentrations, chemical composition and cytotoxicity of real-world PM from combustion of both petroleum diesel and a waste grease 20% biodiesel blend (B20) at a community recycling center operating HDD nonroad equipment...
February 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28235400/implementation-of-cardiovascular-disease-prevention-in-primary-health-care-enhancing-understanding-using-normalisation-process-theory
#9
Nerida Volker, Lauren T Williams, Rachel C Davey, Thomas Cochrane, Tanya Clancy
BACKGROUND: The reorientation of primary health care towards prevention is fundamental to addressing the rising burden of chronic disease. However, in Australia, cardiovascular disease prevention practice in primary health care is not generally consistent with existing guidelines. The Model for Prevention study was a whole-of-system cardiovascular disease prevention intervention, with one component being enhanced lifestyle modification support and addition of a health coaching service in the general practice setting...
February 24, 2017: BMC Family Practice
https://www.readbyqxmd.com/read/28230525/inference-and-forecast-of-h7n9-influenza-in-china-2013-to-2015
#10
Ruiyun Li, Yuqi Bai, Alex Heaney, Sasikiran Kandula, Jun Cai, Xuyi Zhao, Bing Xu, Jeffrey Shaman
The recent emergence of A(H7N9) avian influenza poses a significant challenge to public health in China and around the world; however, understanding of the transmission dynamics and progression of influenza A(H7N9) infection in domestic poultry, as well as spillover transmission to humans, remains limited. Here, we develop a mathematical model-Bayesian inference system which combines a simple epidemic model and data assimilation method, and use it in conjunction with data on observed human influenza A(H7N9) cases from 19 February 2013 to 19 September 2015 to estimate key epidemiological parameters and to forecast infection in both poultry and humans...
February 16, 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/28230456/off-label-prescribing-for-children-with-migraines-in-u-s-ambulatory-care-settings
#11
L Leanne Lai, Leroy Koh, Jane Ai-Chen Ho, Alexander Ting, Augustine Obi
BACKGROUND: Migraines, Which Affect About 10% Of School-Age Children In The United States, Can Significantly Impair Quality Of Life. Despite Potential Disability, Many Children Do Not Receive Treatment Or Prophylaxis, Since Medications Specifically Approved For Children Are Significantly Less Than For Adults. There Is Also Controversy Surrounding The Apparent Widespread Practice Of Prescribing Off-Label Medications For Children With Migraines. However, Little Research Has Been Done To Identify Physician-Prescribing Patterns Of Migraine Medication For Children...
March 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28230450/characteristics-and-medication-use-of-psoriasis-patients-who-may-or-may-not-qualify-for-randomized-controlled-trials
#12
William Malatestinic, Beth Nordstrom, Jashin J Wu, Orin Goldblum, Kathleen Solotkin, Chen-Yen Lin, Kristin Kistler, Kathy Fraeman, Joseph Johnston, Lcdr Lesley Hawley, Nicholas Sicignano, Andre Araujo
BACKGROUND: Clinical trials impose exclusion criteria that may limit the generalizability of results. OBJECTIVES: To (a) determine the percentage of real-world patients who would qualify for psoriasis randomized controlled trials; (b) ascertain differences between moderate-to-severe psoriasis patients who would be eligible, ineligible, or potentially eligible for clinical trials; and (c) compare their biologic treatment patterns. METHODS: Moderate-to-severe psoriasis patients were identified from the U...
March 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28230449/real-world-glycemic-control-from-glp-1ra-therapy-with-and-without-concurrent-insulin-in-patients-with-type-2-diabetes
#13
Mukul Singhal, Sudhir Unni, Marisa Schauerhamer, Hiep Nguyen, Jeff Hurd, Carrie McAdam-Marx
BACKGROUND: Glucagon-like peptide 1 receptor agonists (GLP-1RAs) are recommended as add-on therapy in patients with uncontrolled type 2 diabetes (T2D), with no specific guidance as to timing versus insulin. Furthermore, real-world data assessing GLP-1RA outcomes with or without concurrent insulin therapy are lacking. OBJECTIVE: To identify glycemic response with GLP-1RAs by insulin use in patients with T2D at 1-year follow-up to inform decisions regarding GLP-1RA use with or without insulin...
March 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28230445/benchmarking-insulin-treatment-persistence-among-patients-with-type-2-diabetes-across-different-u-s-payer-segments
#14
Wenhui Wei, Jenny Jiang, Youbei Lou, Sohini Ganguli, Mark S Matusik
BACKGROUND: Treatment persistence with basal insulins is crucial to achieving sustained glycemic control, which is associated with a reduced risk of microvascular disease and other complications of type 2 diabetes (T2D). However, studies suggest that persistence with basal insulin treatment is often poor. OBJECTIVE: To measure and benchmark real-world basal insulin treatment persistence among patients with T2D across different payer segments in the United States...
March 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28230166/a-universal-indicator-of-critical-state-transitions-in-noisy-complex-networked-systems
#15
Junhao Liang, Yanqing Hu, Guanrong Chen, Tianshou Zhou
Critical transition, a phenomenon that a system shifts suddenly from one state to another, occurs in many real-world complex networks. We propose an analytical framework for exactly predicting the critical transition in a complex networked system subjected to noise effects. Our prediction is based on the characteristic return time of a simple one-dimensional system derived from the original higher-dimensional system. This characteristic time, which can be easily calculated using network data, allows us to systematically separate the respective roles of dynamics, noise and topology of the underlying networked system...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28229485/osteoporosis-related-health-services-utilization-following-first-hip-fracture-among-a-cohort-of-privately-insured-women-in-the-united-states-2008-2014-an-observational-study
#16
Catherine W Gillespie, Pamela E Morin
Timely identification and treatment of osteoporosis following hip fracture is recommended to mitigate future fracture risk, yet prior work has demonstrated a disconnect between evidence-based recommendations and real-world implementation. We sought to describe contemporary patterns of osteoporosis screening and initiation of pharmacotherapy following hip fracture based on medical and pharmacy claims in the OptumLabs™ Data Warehouse. From a national sample, we identified 8349 women aged 50+ years enrolled in private commercial or Medicare Advantage plans with no prior history of osteoporosis diagnosis, osteoporosis pharmacotherapy, or hip fracture who experienced a hip fracture between 2008 and 2013...
February 23, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28227968/limb-position-robust-classification-of-myoelectric-signals-for-prosthesis-control-using-sparse-representations
#17
Joseph L Betthauser, Christopher L Hunt, Luke E Osborn, Rahul R Kaliki, Nitish V Thakor, Joseph L Betthauser, Christopher L Hunt, Luke E Osborn, Rahul R Kaliki, Nitish V Thakor, Luke E Osborn, Christopher L Hunt, Nitish V Thakor, Rahul R Kaliki, Joseph L Betthauser
The fundamental objective in non-invasive myoelectric prosthesis control is to determine the user's intended movements from corresponding skin-surface recorded electromyographic (sEMG) activation signals as quickly and accurately as possible. Linear Discriminant Analysis (LDA) has emerged as the de facto standard for real-time movement classification due to its ease of use, calculation speed, and remarkable classification accuracy under controlled training conditions. However, performance of cluster-based methods like LDA for sEMG pattern recognition degrades significantly when real-world testing conditions do not resemble the trained conditions, limiting the utility of myoelectrically controlled prosthesis devices...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227553/transfer-learning-with-large-scale-data-in-brain-computer-interfaces
#18
Chun-Shu Wei, Yuan-Pin Lin, Yu-Te Wang, Chin-Teng Lin, Tzyy-Ping Jung, Chun-Shu Wei, Yuan-Pin Lin, Yu-Te Wang, Chin-Teng Lin, Tzyy-Ping Jung, Yuan-Pin Lin, Yu-Te Wang, Tzyy-Ping Jung, Chin-Teng Lin, Chun-Shu Wei
Human variability in electroencephalogram (EEG) poses significant challenges for developing practical real-world applications of brain-computer interfaces (BCIs). The intuitive solution of collecting sufficient user-specific training/calibration data can be very labor-intensive and time-consuming, hindering the practicability of BCIs. To address this problem, transfer learning (TL), which leverages existing data from other sessions or subjects, has recently been adopted by the BCI community to build a BCI for a new user with limited calibration data...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227533/upper-extremity-post-stroke-motion-quality-estimation-with-decision-trees-and-bagging-forests
#19
Sarvenaz Chaeibakhsh, Elissa Phillips, Amanda Buchanan, Eric Wade, Sarvenaz Chaeibakhsh, Elissa Phillips, Amanda Buchanan, Eric Wade, Elissa Phillips, Sarvenaz Chaeibakhsh, Amanda Buchanan, Eric Wade
Stroke is one of the leading causes of long-term disability. Approximately two thirds of stroke survivors require long-term rehabilitation, which suggests the importance of understanding movement quality in real-world settings. To address this need, we have developed an approach that quantifies physical activity and also evaluates performance quality. Accelerometer and gyroscope sensor data are used to measure upper extremity movements and to develop a mathematical framework to relate objective sensor data to clinical performance metrics...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227321/fall-detection-algorithms-for-real-world-falls-harvested-from-lumbar-sensors-in-the-elderly-population-a-machine-learning-approach
#20
Alan K Bourke, Jochen Klenk, Lars Schwickert, Kamiar Aminian, Espen A F Ihlen, Sabato Mellone, Jorunn L Helbostad, Lorenzo Chiari, Clemens Becker, Alan K Bourke, Jochen Klenk, Lars Schwickert, Kamiar Aminian, Espen A F Ihlen, Sabato Mellone, Jorunn L Helbostad, Lorenzo Chiari, Clemens Becker, Lorenzo Chiari, Lars Schwickert, Kamiar Aminian, Clemens Becker, Jorunn L Helbostad, Jochen Klenk, Alan K Bourke, Sabato Mellone, Espen A F Ihlen
Automatic fall detection will promote independent living and reduce the consequences of falls in the elderly by ensuring people can confidently live safely at home for linger. In laboratory studies inertial sensor technology has been shown capable of distinguishing falls from normal activities. However less than 7% of fall-detection algorithm studies have used fall data recorded from elderly people in real life. The FARSEEING project has compiled a database of real life falls from elderly people, to gain new knowledge about fall events and to develop fall detection algorithms to combat the problems associated with falls...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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