Statistics and Probability Commons^™

Field Drilling Data Cleaning And Preparation For Data Analytics Applications, Daniel Cardoso Braga

LSU Master's Theses

Throughout the history of oil well drilling, service providers have been continuously striving to improve performance and reduce total drilling costs to operating companies. Despite constant improvement in tools, products, and processes, data science has not played a large part in oil well drilling. With the implementation of data science in the energy sector, companies have come to see significant value in efficiently processing the massive amounts of data produced by the multitude of internet of thing (IOT) sensors at the rig. The scope of this project is to combine academia and industry experience to analyze data from 13 different …

Epidemiologic Evaluation Of Nhanes For Environmental Factors And Periodontal Disease, P. Emecen-Huja, H. -F. Li, J. L. Ebersole, J. Lambert, Heather M. Bush

Biostatistics Faculty Publications

Periodontitis is a chronic inflammation that destroys periodontal tissues caused by the accumulation of bacterial biofilms that can be affected by environmental factors. This report describes an association study to evaluate the relationship of environmental factors to the expression of periodontitis using the National Health and Nutrition Examination Study (NHANES) from 1999–2004. A wide range of environmental variables (156) were assessed in patients categorized for periodontitis (n = 8884). Multiple statistical approaches were used to explore this dataset and identify environmental variable patterns that enhanced or lowered the prevalence of periodontitis. Our findings indicate an array of environmental variables were …

An Interdisciplinary Weight Loss Program Improves Body Composition And Metabolic Profile In Adolescents With Obesity: Associations With The Dietary Inflammatory Index, Yasmin Alaby Martins Ferreira, Ana Claudia Pelissari Kravchychyn, Sofia De Castro Ferreira Vicente, Raquel Munhoz Da Silveira Campos, Lian Tock, Lila Missae Oyama, Valter Tadeu Boldarine, Deborah Cristina Landi Masquio, David Thivel, Nitin Shivappa, James R. Hébert, Ana R. Dâmaso

Faculty Publications

Background and Aims: The prevalence of overweight and obesity consitutes a global epidemic and it is growing around the world. Food and nutrition are essential requirements for promoting health and protecting against non-communicable chronic diseases, such as obesity and cardiovascular disease. Specific dietary components may modulate inflammation and oxidative stress in obese individuals. The Dietary Inflammatory Index (DII®) was developed to characterize the anti- and pro-inflammatory effects of individuals' diet. Few studies have investigated the role of diet-associated inflammation in adolescents with obesity. The present study aims to investigate the effects of an interdisciplinary weight loss therapy on DII scores …

Implementation Of Multivariate Artificial Neural Networks Coupled With Genetic Algorithms For The Multi-Objective Property Prediction And Optimization Of Emulsion Polymers, David Chisholm

Master's Theses

Machine learning has been gaining popularity over the past few decades as computers have become more advanced. On a fundamental level, machine learning consists of the use of computerized statistical methods to analyze data and discover trends that may not have been obvious or otherwise observable previously. These trends can then be used to make predictions on new data and explore entirely new design spaces. Methods vary from simple linear regression to highly complex neural networks, but the end goal is similar. The application of these methods to material property prediction and new material discovery has been of high interest …

Positivity-Preserving, Energy Stable Numerical Schemes For The Cahn-Hilliard Equation With Logarithmic Potential, Wenbin Chen, Cheng Wang, Xiaoming Wang, Steven M. Wise

Mathematics and Statistics Faculty Research & Creative Works

In this paper we present and analyze finite difference numerical schemes for the Cahn-Hilliard equation with a logarithmic Flory Huggins energy potential. Both first and second order accurate temporal algorithms are considered. in the first order scheme, we treat the nonlinear logarithmic terms and the surface diffusion term implicitly and update the linear expansive term and the mobility explicitly. We provide a theoretical justification that this numerical algorithm has a unique solution, such that the positivity is always preserved for the logarithmic arguments, i.e., the phase variable is always between −1 and 1, at a point-wise level. in particular, our …

Involuntary Hospitalization Among Young People With Early Psychosis: A Population-Based Study Using Health Administrative Data., Rebecca Rodrigues, Arlene G Macdougall, Guangyong Zou, Michael Lebenbaum, Paul Kurdyak, Lihua Li, Salimah Z Shariff, Kelly K Anderson

Epidemiology and Biostatistics Publications

OBJECTIVE: Early psychosis is an important window for establishing long-term trajectories. Involuntary hospitalization during this period may impact subsequent service engagement in people with newly diagnosed psychotic disorder. However, population-based studies of involuntary hospitalization in early psychosis are lacking. We sought to estimate the proportion of people aged 16 to 35 years with early psychosis in Ontario who are hospitalized involuntarily at first admission, and to identify the associated risk factors and outcomes.

METHODS: Using linked population-based health administrative data, we identified incident cases of non-affective psychosis over a five-year period (2009-2013) and followed cases for two years to ascertain …

Image-Based Modeling Of Blood Flow In Cerebral Aneurysms Treated With Intrasaccular Flow Diverting Devices, Fernando Mut, Bong Jae Chung, Jorge Chudyk, Pedro Lylyk, Ramanathan Kadirvel, David F. Kallmes, Juan R. Cebral

Department of Applied Mathematics and Statistics Faculty Scholarship and Creative Works

Modeling the flow dynamics in cerebral aneurysms after the implantation of intrasaccular devices is important for understanding the relationship between flow conditions created immediately posttreatment and the subsequent outcomes. This information, ideally available a priori based on computational modeling prior to implantation, is valuable to identify which aneurysms will occlude immediately and which aneurysms will likely remain patent and would benefit from a different procedure or device. In this report, a methodology for modeling the hemodynamics in intracranial aneurysms treated with intrasaccular flow diverting devices is described. This approach combines an image-guided, virtual device deployment within patient-specific vascular models with …

Tumor Heterogeneity As A Predictor Of Response To Neoadjuvant Chemotherapy In Locally Advanced Rectal Cancer, Alissa Greenbaum, David R. Martin, Therese J. Bocklage, Ji-Hyun Lee, Scott A. Ness, Ashwani Rajput

Pathology and Laboratory Medicine Faculty Publications

BACKGROUND: Neoadjuvant chemoradiotherapy (nCRT) is the standard of care for locally advanced adenocarcinoma of the rectum, but it is currently unknown which patients have disease that will respond. This study tested the correlation between response to nCRT and intratumoral heterogeneity using next-generation sequencing assays.

PATIENTS AND METHODS: DNA was extracted from formalin-fixed, paraffin-embedded biopsy samples from a cohort of patients with locally advanced rectal adenocarcinoma (T3/4 or N1/2 disease) who received nCRT. High read-depth sequencing of > 400 cancer-relevant genes was performed. Tumor mutations and variant allele frequencies were used to calculate mutant-allele tumor heterogeneity (MATH) scores as measures of intratumoral …

Analysis Of An M/M/1 Queue With Working Vacation And Vacation Interruption, Shakir Majid, P. Manoharan

Applications and Applied Mathematics: An International Journal (AAM)

In this paper, an M/M/1 queue with working vacation and vacation interruption is investigated. The server is supposed to interrupt the vacation and return back to the normal working period, if there are at least N customers waiting in the system at a service completion instant during the working vacation period. Otherwise, the server continues the vacation until the system is nonempty after a vacation ends or there are at least N customers after a service ends. In terms of the quasi birth and death process and matrix-geometric solution method, we obtain the distributions for the stationary queue length. Moreover, …

Performance And Economic Evaluation Of Differentiated Multiple Vacation Queueing System With Feedback And Balked Customers, Amina A. Bouchentouf, Latifa Medjahri

Applications and Applied Mathematics: An International Journal (AAM)

The present paper deals with a single server feedback queueing system under two differentiated multiple vacations and balked customers. It is assumed that the service times of the two vacation types are exponentially distributed with different means. The steady-state probabilities of the model are obtained. Some important performance measures of the system are derived. Then, a cost model is developed. Further, a numerical study is presented.

Exact Reliability For Consecutive K-Out-Of-R-From-N: F System With Equal And Unequal Components Probabilities, Yaser Amirian, Ahmad Khodadadi, Omid Chatrabgoun

Applications and Applied Mathematics: An International Journal (AAM)

A consecutive k-out-of-r-from-n: F system consists of n linear ordered components such that the system fails if and only if there exist a set of r consecutive linear component that contains at least k failed components. Consecutive k-out-of-r-from-n: F system has been considered in many fields such as reliability analysis. All recent efforts in this area have been focused on acquiring band or approximation for their reliability such that less attention has been paid to their closed form and exact reliability in the literature. In the present paper, with designing an innovative algorithm the exact reliability for extensive class of …

Transient Analysis Of A Markovian Single Vacation Feedback Queue With An Interrupted Closedown Time And Control Of Admission During Vacation, A. Azhagappan, T. Deepa

Applications and Applied Mathematics: An International Journal (AAM)

This paper analyzes the transient behavior of an M/M/1 queueing model with single vacation, feedback, interrupted closedown time and control of admission during vacation. The time-dependent system size probabilities for the proposed model are obtained using generating function in the closed form. Further, the system performance measures like mean and variance of system size are also obtained for the time-dependent case. Finally, numerical illustrations are presented to understand the effect for various system parameters.

Construction And Application Of Log-Linear Models To Assess Academic Performance, Indika R. Wickramasinghe

Applications and Applied Mathematics: An International Journal (AAM)

Log-Linear Models (LLMs) are important techniques used in categorical data analysis. Though there are some available published work about LLMs, the explanation of model building process and the theoretical background are not adequate. Furthermore, research about the application of the LLM theory and the selection procedure of the best model are handful. Therefore, this manuscript aims to fill that vacuum. At first, the construction of LLM and Hierarchical Log-Linear Models (HLLMs), a branch of LLMs are discussed in connection with both 2×2 and 2×2 ×2 contingency tables. Secondly, an application is presented to analyze the collected data set about the …

Modeling The Water-Energy-Food Nexus In Obr-E’S: The Eight (8) Coordinates, S. Sani, A. Tumushabe, M. U. Osigwe, M. Mbatudde, A. S. Hassan, M. Edson

Applications and Applied Mathematics: An International Journal (AAM)

The need to formulate quantifiers for water, energy and food (WEF) is necessary sequel to conservation issues worldwide. Existing methodologies on the WEF nexus appear less fitting in sustainability arguments because of incompleteness. This article analyzes the WEF nexus in open but restricted environments (ObR-E’s) with completeness assumption in form of the known inter-intra dependence of nexus elements for sustainability and better conservation practice. The analysis leads to the discovery of the Jalingo equation whose any non simplistic solution is a solution to the WEF problem in some ObR-E’s world wide. It is important to seek other non simplistic solutions …

Analysis Of M[X1],M[X2]/G1,G2/1 Retrial Queueing System With Priority Services, Working Breakdown, Collision, Bernoulli Vacation, Immediate Feedback, Starting Failure And Repair, G. Ayyappan, P. Thamizhselvi, B. Somasundaram

Applications and Applied Mathematics: An International Journal (AAM)

This paper considers an M^[X₁] , M^[X₂] /G1,G2/1 general retrial queueing system with priority services. Two types of customers from different classes arrive at the system in different independent compound Poisson processes. The server follows the non-pre-emptive priority rule subject to working breakdown, Bernoulli vacation, starting failure, immediate feedback, collision and repair. After completing each service, the server may go for a vacation or remain idle in the system. The priority customers who find the server busy are queued in the system. If a low-priority customer finds the server busy, he is routed to …

A Note On Asymptotic Normality Of A Copula Function In Regression Model, Khadidja Sabri, Mustapha Meghnafi, Abbes Rabhi, Djamila Bennafla

Applications and Applied Mathematics: An International Journal (AAM)

Over the last decade, there has been significant and rapid development of the theory of copulas. Much of the work has been motivated by their applications to stochastic processes, economics, risk management, finance, insurance, the environment (hydrology, climate, etc.), survival analysis, and medical sciences. In many statistical models. The copula approach is a way to solve the difficult problem of finding the whole bivariate or multivariate distribution. In this paper, we give the asymptotic normality of the copulas function in a regression model.

Study Of Specially And Temporally Dependent Adsorption Coefficient In Heterogeneous Porous Medium, Dilip K. Jaiswal, Gulrana _

Applications and Applied Mathematics: An International Journal (AAM)

One-dimensional advection-dispersion equation (ADE) is studied along unsteady longitudinal flow through a semi-infinite heterogeneous medium. Adsorption coefficient is considered temporally and spatially–dependent function i.e., expressed in degenerate form. The dispersion parameter is considered as inversely proportional to adsorption coefficient. The input source is of pulse type. The Laplace Transformation Technique (LTT) is used to obtain the analytical solution by introducing certain new independent variables through separate transformations. The effects of adsorption, heterogeneity and unsteadiness are investigated and discussed with the help of various graphs.

The Martingale Approach To Financial Mathematics, Jordan M. Rowley

Master's Theses

In this thesis, we will develop the fundamental properties of financial mathematics, with a focus on establishing meaningful connections between martingale theory, stochastic calculus, and measure-theoretic probability. We first consider a simple binomial model in discrete time, and assume the impossibility of earning a riskless profit, known as arbitrage. Under this no-arbitrage assumption alone, we stumble upon a strange new probability measure Q, according to which every risky asset is expected to grow as though it were a bond. As it turns out, this measure Q also gives the arbitrage-free pricing formula for every asset on our market. In …

Optimizing Electrospun Ceramic Nanofiber Strength Through Two-Step Sintering, Michael Ross

Materials Engineering

Two-step sintering (TSS) consists of a high-temperature step and immediate cooling to a sintering temperature for an extended sintering time, where grain growth is suppressed by severe densification during the high-temperature step. TSS is adopted to enhance mechanical properties of electrospun ceramic nanofibers (CNFs), a class of porous ceramics used for environmental remediation, optoelectronics, and filtration. PVP and Ga(NO₃)₃ nanofiber mesh, provided by Lawrence Livermore National Laboratory, was shaped, oxidized, and two-step sintered to form a nanocrystalline β-Ga₂O₃ CNF tube using a high-temperature step of 1,000^oC. Sintering temperatures and times varied from …

Cs + Sociology: Using Big Data To Identify And Understand Educational Inequality In America (1), Joseph Cleary, Elin Waring

Open Educational Resources

This is the first of two lessons/labs for teaching and learning of computer science and sociology. Either and be used on their own or they can be used in sequence, in which case this should be used first.

Students will develop CS skills and behaviors including but not limited to: learning what an API is, learning how to access and utilize data on an API, and developing their R coding skills and knowledge. Students will also learn basic, but important, sociological principles such as how poverty is related to educational opportunities in America. Although prior knowledge of CS and sociology …

Statistical Machine Learning Methods For Mining Spatial And Temporal Data, Fei Tan

Dissertations

Spatial and temporal dependencies are ubiquitous properties of data in numerous domains. The popularity of spatial and temporal data mining has thus grown with the increasing prevalence of massive data. The presence of spatial and temporal attributes not only provides complementary useful perspectives, but also poses new challenges to the representation and integration into the learning procedure. In this dissertation, the involved spatial and temporal dependencies are explored with three genres: sample-wise, feature-wise, and target-wise. A family of novel methodologies is developed accordingly for the dependency representation in respective scenarios.

First, dependencies among discrete, continuous and repeated observations are studied …

Risk Assesment Of Air Pollution Exposure (No2, So2, Total Suspended Particulate, And Particulate Matter 10 Micron) And Smoking Habits On The Lung Function Of Bus Drivers In Palembang City, Elvi Sunarsih, Suheryanto Suheryanto, Rini Mutahar, Rahmi Garmini

Kesmas

Nitrogen dioxide (NO2), carbon monoxide (CO), sulfur dioxide (SO2), Particulate Matter (PM10) and TSP are the most common and harmful air pollutants to humans. In short period, air pollution exposure at 5 ppm for 10 minutes to humans causes dyspnea, and when the level is increase to 800 ppm could cause 100% mortality in animals. This study was an analytical research, with cross sectional design and risk analysis. One hundred subjects were analyzed in this study. The results showed that non-cancer Hazard Index (HI) for realtime exposure with mean value was NO2: 1.85; SO2: 2.92; TSP: 7.09; and PM10: 11.7 …

Obesity As Type 2 Diabetes Common Comorbidity: Study Of Type 2 Diabetes Patients’ Eating Behaviour And Other Determinants In Jakarta, Indonesia, Isna Aulia Fajarini, Ratu Ayu Dewi Sartika

Kesmas

Obesity is one of the comorbidities widely occurred among type 2 diabetes patients. It is one of the most modifiable risk factors for the prevention of other comorbid conditions such as diabetic nephropathy and cardiovascular disease. The aim of this study was to recognize eating behaviour, physical activity, and other related factors, also their correlation with obesity as comorbidity among type 2 diabetes patients. Using cross-sectional design, data were collected from purposively selected 133 members of “PROLANIS” in Jatinegara Primary Health Care, East Jakarta. Food intake was assessed by 1x24 hours food recall and FFQ, physical activity by GPAQ. The …

Post Hypertension And Stroke: A Case Control Study, Aulia Imanda, Santi Martini, Kurnia Dwi Artanti

Kesmas

The purpose of this study was to determine the factors that influence the incidence of stroke including smoking status, past hypertension , past diabetes, diet, physical activity, alcohol consumption. The design of this study is case control with a ratio of 1: 1. The total number of respondents is 132 people. Research subjects were selected using systematic random sampling. This research was conducted at Ngudi Waluyo Hospital in Wlingi. Blitar, Indonesia in October till November 2017. Bivariate analysis showed that factors significantly related to stroke were smoking status (p=0.011, OR=2.6), history of past hypertension (p=0.00, OR= 6), past diabetes (p=0.015 …

Type 2 Diabetes Patients’ Need For Physical Activity Programming: A Qualitative Study At A Yogyakarta Hospital Clini, Novita Intan Arovah, Bernadeta Wara Kushartanti, Tracy L. Washington, Kristiann C. Heesch

Kesmas

Physical activity programs offered in Indonesian hospitals are often inadequate to help type 2 diabetes (T2D) patients meet international physical activity recommendations. This study aimed to identify T2D patients’ physical activity enablers and barriers, their preferences for, and experiences with, physical activity programming, with a view to developing future programs that are suited to these patients’ needs and preferences. Four focus groups were conducted with 28 patients (50% female) of the T2D clinic at the Local General Hospital of Yogyakarta. Discussions were thematically analysed in NVivo 10. The most reported types of physical activity were walking and participation in the …

Dengue Haemorrhagic Fever And House Conditions In Kupang City, East Nusa Tenggara Province, Wanti Wanti, Ririh Yudhastuti, Hari Basuki Notobroto, Sri Subekti, Oktofianus Sila, Ragu Harming Kristina, Feby Dwirahmadi

Kesmas

Kupang City has the highest Incidence of DHF in East Nusa Tenggara and also higher than the national figure. This study aims to analyze the relationship between housing conditions and the DHF incidence in the Kupang City. This observational study uses a case-control study in 25 villages with a total sample of 500 people. Data is analyzed using t test and chi square test. The house conditions were significantly related to the DHF incidence (p≤0.05), namely house lighting, water usage, wall construction, ventilation area and ownership of clean water facilities. People are advised to ventilate the house ≥10% of the …

Risk Factor Analysis Of Overnutrition Among Elementary School Children In Pekanbaru: An Urban-Rural Perspective, Arfianti Arfianti

Kesmas

The prevalence of childhood overnutrition is increasing in many parts of the world including Indonesia. National basic health research (RISKESDAS) 2010 showed that over-nutrition in urban children (10.4%) was greater than in rural areas (8.1%). The purpose of this study was to analyse risk factors for overnutrition on elementary students in urban and rural areas in Pekanbaru. This was an observasional analytical study with cross-sectional design. This study involved 137 urban and 113 rural students from six elementary schools in Pekanbaru recruited by quota sampling technique. This study was conducted between April-May 2018. The results showed that the proportions of …

Occurrence Of Natural Vertical Transmission Of “Zika Like Virus” In Aedes Aegypti Mosquito In Jambi City, Tri Baskoro Satoto, Nur Alvira Pasca Wati, Wida Purwaningsih, Hari Kusnanto Josef, Purwono Purwono, Rumbiwati Rumbiwati, Hermanto Hermanto, Roger Frutos

Kesmas

Zika virus can be transmitted through mosquitoes such as Aedes aegypti and Ae. albopictus. During the transition period of 2014–2015, an outbreak of dengue was reported in Jambi City, during which several sufferers were screened positive for Zika virus infection by the Eijkman Institute. It was interesting to note that all of those positive for Zika virus infection were indigenous residents and none of them had a history of international travel. This descriptive analytic study with a cross-sectional design study was conducted to present an overview of Aedes spp. population using ovitrap and egg colonization methods and to detect the …

Factors Related To Adolescent Behavior Towards Hiv/Aids Prevention, Yuliasti Eka Purnamaningrum, Ratyas Ekartika Puspita Candra Nugrahawati, Munica Rita Hernayanti, Anne Vajee

Kesmas

In 2016 Special Region of Yogyakarta was ranked 9th as the province with the highest number of people suffered from HIV/AIDS especially at Sleman regency. Globally, AIDS was the second leading cause of adolescents’s death aged of 10-19 years. The purpose of this study was to find out factors affecting the behaviour of the adolescents towards HIV/AIDS prevention. This research using with cross sectional study design. The sampling technique which used was stratified random sampling resulted in 59 respondents from 11th grade students at SMA Negeri 2 Sleman were selected as sample. Data were collected using questionnaire and analyzed using …

Adiposity Mediates The Association Between The Dietary Inflammatory Index And Markers Of Type 2 Diabetes Risk In Middle-Aged Black South African Women, Asanda Mtintsilana, Lisa K. Micklesfield, Elin Chorell, Tommy Olsson, Nitin Shivappa, James R. Hebert, Andre P. Kengne, Julia H. Goedecke

Faculty Publications

The dietary inflammatory index (DII^®), a validated tool used to measure the inflammatory potential of the diet, has been associated with metabolic disorders in various settings, but not in African populations. The aim of this study was to investigate whether the DII is associated with markers of type 2 diabetes (T2D) risk, and if this association is mediated by adiposity and/or low-grade inflammation, in black South Africa women. Energy-adjusted-DII (E-DII) scores were calculated in 190 women (median age, 53 years) from the Birth-to-Twenty plus cohort using a validated food frequency questionnaire. Fasting glucose, insulin, HbA1c, and inflammatory cytokines …