Download or read book A mixed model approach for intent to treat analysis in longitudinal clinical trials with missing values written by Hrishikesh Chakraborty and published by RTI Press. This book was released on 2009-02-28 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Missing values and dropouts are common issues in longitudinal studies in all areas of medicine and public health. Intent-to-treat (ITT) analysis has become a widely accepted method for the analysis of controlled clinical trials. In most controlled clinical trials, some patients do not complete their intended followup according to the protocol for a variety of reasons; this problem generates missing values. Missing values lead to concern and confusion in identifying the ITT population, which makes the data analysis more complex and challenging. No adequate strategy exists for ITT analyses of longitudinal controlled clinical trial data with missing values. Several ad hoc strategies for dealing with missing values for an ITT analysis are common in the practice of controlled clinical trials. We performed a detailed investigation based on simulation studies to develop recommendations for this situation. We compared sizes (type I errors) and power between some popular ad hoc approaches and the linear mixed model approach under different missing value scenarios. Our results suggest that, for studies with a high percentage of missing values, the mixed model approach without any ad hoc imputation is more powerful than other options.
Download or read book A Mixed Model Approach for Intent to Treat Analysis in Longitudinal Clinical Trials with Missing Values written by Hrishikesh Chakraborty and published by . This book was released on 2009 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analyzing Longitudinal Clinical Trial Data written by Craig Mallinckrodt and published by CRC Press. This book was released on 2016-12-12 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analyzing Longitudinal Clinical Trial Data: A Practical Guide provide practical and easy to implement approaches for bringing the latest theory on analysis of longitudinal clinical trial data into routine practice.?This book, with its example-oriented approach that includes numerous SAS and R code fragments, is an essential resource for statisticians and graduate students specializing in medical research. The authors provide clear descriptions of the relevant statistical theory and illustrate practical considerations for modeling longitudinal data. Topics covered include choice of endpoint and statistical test; modeling means and the correlations between repeated measurements; accounting for covariates; modeling categorical data; model verification; methods for incomplete (missing) data that includes the latest developments in sensitivity analyses, along with approaches for and issues in choosing estimands; and means for preventing missing data. Each chapter stands alone in its coverage of a topic. The concluding chapters provide detailed advice on how to integrate these independent topics into an over-arching study development process and statistical analysis plan.
Download or read book Nursing and Health Interventions written by Souraya Sidani and published by John Wiley & Sons. This book was released on 2021-04-22 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nursing and Health Interventions covers the conceptual, empirical, and practical knowledge required for engaging in intervention research. This revised edition provides step-by-step guidance on the complex process of intervention development and methods for developing, delivering, evaluating and implementing intervention, supported by a wealth of examples. The text describes each essential aspect of intervention research, from generating an intervention theory, to procedures for adopting evidence-based interventions in practice. This second edition provides up-to-date coverage of intervention research and its impact on improving standards of care. Throughout the text, readers are provided with the foundational knowledge required for generating evidence that informs treatment decisions in practice, and choosing the best approaches for designing, delivering, evaluating and implementing interventions. A valuable ‘one-stop’ resource for students, researchers, and health professionals alike, this book: Covers the importance and issues of evidence-based healthcare practice, the role of theory in research in the intervention design and evaluation, and evaluation of effectiveness and implementation of interventions in a single volume Reviews the decision-making steps and the knowledge needed to inform decisions in research and practice Discusses the limitations of evidence derived from randomized controlled trials (RCTs) Written by leading experts in the field, Nursing and Health Interventions remains an invaluable resource for nursing and healthcare students, researchers, and health practitioners wanting to understand and apply intervention to improve the quality of care.
Download or read book Cancer Disparities written by Ronit Elk and published by Springer Publishing Company. This book was released on 2012 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been remarkable progress in understanding, preventing, detecting, diagnosing, and treating cancer, resulting in a reduction of cancer incidence and mortality in the United States. Despite this, the cancer burden varies considerably by race/ethnicity and socioeconomic status. Cancer incidence rates vary markedly between racial/ethnic groups, but even more startling are the differences in outcome across groups. Cancer Disparities: Causes and Evidence-Based Solutions helps readers understand the scope and causes of this inequity by providing a detailed analysis of the many factors that result in cancer disparities across the cancer continuum, including the role of race/ethnicity, socioeconomic status, access to and use of services, insurance status, geographic variables, and differences in treatment provided to patients. Further, it is the first book to describe evidence-based, concrete solutions that can be used to reduce or even eliminate cancer health disparities. Fifteen previously unpublished studies of interventions designed specifically to achieve health equality are described. These studies focus on contextually and culturally appropriate strategies to enhance cancer prevention, screening and early detection, treatment, symptom management, and quality of life in underserved populations.
Download or read book Psychodynamic Interventions in Pregnancy and Infancy written by Björn Salomonsson and published by Routledge. This book was released on 2018-04-17 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Psychodynamic Interventions in Pregnancy and Infancy builds on Björn Salomonsson’s experiences as a psychoanalytic consultant working with parents and their babies. Emotional problems during the perinatal stages can arise and be observed and addressed by a skilled midwife, nurse or health visitor. Salomonsson has developed a method combining nurse supervision and therapeutic consultations which has lowered the thresholds for parents to come and talk with him. The brief consultations concern pregnant women, mother and baby, husband and wife, toddler and parent. The theoretical framework is psychoanalytic, but the mode of work is eclectic and adapted to the family’s situation and its members’ motivation. This book details such work, which can be applied globally; perinatal psychotherapy integrated with ordinary medical health care. It also explains how psychotherapy can be made more accessible to a larger population. Via detailed case presentations, the author takes the reader through pregnancy, childbirth and the first few years of life. He also brings in research studies emphasizing the importance of early interventions, with the aim of providing therapists with arguments for such work in everyday family health care. To further substantiate such arguments, the book ends with theoretical chapters and, finally, the author’s vision of the future of a perinatal health care that integrates medical and psychological perspectives. Psychodynamic Interventions in Pregnancy and Infancy will appeal to all psychoanalysts and psychoanalytic psychotherapists working in this area, as well as clinical psychologists, clinical social workers and medical personnel working with parents and infants.
Download or read book Psychoanalytic Therapy with Infants and their Parents written by Björn Salomonsson and published by Routledge. This book was released on 2014-04-24 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Psychoanalytic Therapy with Infants and Parents provides a clear guide to clinical psychoanalytic work with distressed babies and unhappy parents, a numerous clinical group so often in need of urgent help. Although psychoanalytic work is primarily verbal, and infants may have limited language, this form of treatment is receiving increased attention among therapists. Björn Salomonsson explores how such work can be possible and benefit infants, how to work with the parents (especially the mother), and how major psychoanalytic concepts such as primal repression, infantile sexuality and transference can be worked with and understood in these therapies. Björn Salomonsson argues that attachment concepts, though important, cannot solely help explain everyday problems with breastfeeding, sleeping, and weaning, or more recalcitrant interaction disorders. He shows how we also need psychoanalytic concepts to better understand, not only such "baby worries", but also adult clients' non-verbal communications and interactions. Throughout, he uses extensive practice-based examples and also refers to his research which provides evidence for the effectiveness of this practice. Psychoanalytic Therapy with Infants and Parents provides a unique perspective on working psychoanalytically with parents and infants. This book will be essential reading for psychoanalysts and therapists working with children as well as adults.
Download or read book Statistical Analysis with Missing Data written by Roderick J. A. Little and published by John Wiley & Sons. This book was released on 2019-03-21 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date, comprehensive treatment of a classic text on missing data in statistics The topic of missing data has gained considerable attention in recent decades. This new edition by two acknowledged experts on the subject offers an up-to-date account of practical methodology for handling missing data problems. Blending theory and application, authors Roderick Little and Donald Rubin review historical approaches to the subject and describe simple methods for multivariate analysis with missing values. They then provide a coherent theory for analysis of problems based on likelihoods derived from statistical models for the data and the missing data mechanism, and then they apply the theory to a wide range of important missing data problems. Statistical Analysis with Missing Data, Third Edition starts by introducing readers to the subject and approaches toward solving it. It looks at the patterns and mechanisms that create the missing data, as well as a taxonomy of missing data. It then goes on to examine missing data in experiments, before discussing complete-case and available-case analysis, including weighting methods. The new edition expands its coverage to include recent work on topics such as nonresponse in sample surveys, causal inference, diagnostic methods, and sensitivity analysis, among a host of other topics. An updated “classic” written by renowned authorities on the subject Features over 150 exercises (including many new ones) Covers recent work on important methods like multiple imputation, robust alternatives to weighting, and Bayesian methods Revises previous topics based on past student feedback and class experience Contains an updated and expanded bibliography The authors were awarded The Karl Pearson Prize in 2017 by the International Statistical Institute, for a research contribution that has had profound influence on statistical theory, methodology or applications. Their work "has been no less than defining and transforming." (ISI) Statistical Analysis with Missing Data, Third Edition is an ideal textbook for upper undergraduate and/or beginning graduate level students of the subject. It is also an excellent source of information for applied statisticians and practitioners in government and industry.
Download or read book Principles and Practice of Clinical Trials written by Steven Piantadosi and published by Springer Nature. This book was released on 2022-07-19 with total page 2573 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a comprehensive major reference work for our SpringerReference program covering clinical trials. Although the core of the Work will focus on the design, analysis, and interpretation of scientific data from clinical trials, a broad spectrum of clinical trial application areas will be covered in detail. This is an important time to develop such a Work, as drug safety and efficacy emphasizes the Clinical Trials process. Because of an immense and growing international disease burden, pharmaceutical and biotechnology companies continue to develop new drugs. Clinical trials have also become extremely globalized in the past 15 years, with over 225,000 international trials ongoing at this point in time. Principles in Practice of Clinical Trials is truly an interdisciplinary that will be divided into the following areas: 1) Clinical Trials Basic Perspectives 2) Regulation and Oversight 3) Basic Trial Designs 4) Advanced Trial Designs 5) Analysis 6) Trial Publication 7) Topics Related Specific Populations and Legal Aspects of Clinical Trials The Work is designed to be comprised of 175 chapters and approximately 2500 pages. The Work will be oriented like many of our SpringerReference Handbooks, presenting detailed and comprehensive expository chapters on broad subjects. The Editors are major figures in the field of clinical trials, and both have written textbooks on the topic. There will also be a slate of 7-8 renowned associate editors that will edit individual sections of the Reference.
Download or read book Missing Data in Clinical Studies written by Geert Molenberghs and published by John Wiley & Sons. This book was released on 2007-04-04 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Missing Data in Clinical Studies provides a comprehensive account of the problems arising when data from clinical and related studies are incomplete, and presents the reader with approaches to effectively address them. The text provides a critique of conventional and simple methods before moving on to discuss more advanced approaches. The authors focus on practical and modeling concepts, providing an extensive set of case studies to illustrate the problems described. Provides a practical guide to the analysis of clinical trials and related studies with missing data. Examines the problems caused by missing data, enabling a complete understanding of how to overcome them. Presents conventional, simple methods to tackle these problems, before addressing more advanced approaches, including sensitivity analysis, and the MAR missingness mechanism. Illustrated throughout with real-life case studies and worked examples from clinical trials. Details the use and implementation of the necessary statistical software, primarily SAS. Missing Data in Clinical Studies has been developed through a series of courses and lectures. Its practical approach will appeal to applied statisticians and biomedical researchers, in particular those in the biopharmaceutical industry, medical and public health organisations. Graduate students of biostatistics will also find much of benefit.
Download or read book Multiple Imputation for Nonresponse in Surveys written by Donald B. Rubin and published by John Wiley & Sons. This book was released on 2009-09-25 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demonstrates how nonresponse in sample surveys and censuses can be handled by replacing each missing value with two or more multiple imputations. Clearly illustrates the advantages of modern computing to such handle surveys, and demonstrates the benefit of this statistical technique for researchers who must analyze them. Also presents the background for Bayesian and frequentist theory. After establishing that only standard complete-data methods are needed to analyze a multiply-imputed set, the text evaluates procedures in general circumstances, outlining specific procedures for creating imputations in both the ignorable and nonignorable cases. Examples and exercises reinforce ideas, and the interplay of Bayesian and frequentist ideas presents a unified picture of modern statistics.
Download or read book Analysis of Observational Health Care Data Using SAS written by Douglas E. Faries and published by SAS Press. This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book guides researchers in performing and presenting high-quality analyses of all kinds of non-randomized studies, including analyses of observational studies, claims database analyses, assessment of registry data, survey data, pharmaco-economic data, and many more applications. The text is sufficiently detailed to provide not only general guidance, but to help the researcher through all of the standard issues that arise in such analyses. Just enough theory is included to allow the reader to understand the pros and cons of alternative approaches and when to use each method. The numerous contributors to this book illustrate, via real-world numerical examples and SAS code, appropriate implementations of alternative methods. The end result is that researchers will learn how to present high-quality and transparent analyses that will lead to fair and objective decisions from observational data. This book is part of the SAS Press program.
Download or read book Whole body Electromyostimulation A Training Technology to Improve Health and Performance in Humans written by Wolfgang Kemmler and published by Frontiers Media SA. This book was released on 2020-07-08 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Statistical Power Analysis with Missing Data written by Adam Davey and published by Routledge. This book was released on 2009-08-20 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statistical power analysis has revolutionized the ways in which we conduct and evaluate research. Similar developments in the statistical analysis of incomplete (missing) data are gaining more widespread applications. This volume brings statistical power and incomplete data together under a common framework, in a way that is readily accessible to those with only an introductory familiarity with structural equation modeling. It answers many practical questions such as: How missing data affects the statistical power in a study How much power is likely with different amounts and types of missing data How to increase the power of a design in the presence of missing data, and How to identify the most powerful design in the presence of missing data. Points of Reflection encourage readers to stop and test their understanding of the material. Try Me sections test one’s ability to apply the material. Troubleshooting Tips help to prevent commonly encountered problems. Exercises reinforce content and Additional Readings provide sources for delving more deeply into selected topics. Numerous examples demonstrate the book’s application to a variety of disciplines. Each issue is accompanied by its potential strengths and shortcomings and examples using a variety of software packages (SAS, SPSS, Stata, LISREL, AMOS, and MPlus). Syntax is provided using a single software program to promote continuity but in each case, parallel syntax using the other packages is presented in appendixes. Routines, data sets, syntax files, and links to student versions of software packages are found at www.psypress.com/davey. The worked examples in Part 2 also provide results from a wider set of estimated models. These tables, and accompanying syntax, can be used to estimate statistical power or required sample size for similar problems under a wide range of conditions. Class-tested at Temple, Virginia Tech, and Miami University of Ohio, this brief text is an ideal supplement for graduate courses in applied statistics, statistics II, intermediate or advanced statistics, experimental design, structural equation modeling, power analysis, and research methods taught in departments of psychology, human development, education, sociology, nursing, social work, gerontology and other social and health sciences. The book’s applied approach will also appeal to researchers in these areas. Sections covering Fundamentals, Applications, and Extensions are designed to take readers from first steps to mastery.
Download or read book Statistics for Advanced Practice Nurses and Health Professionals written by Manfred Stommel, PhD and published by Springer Publishing Company. This book was released on 2014-06-09 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive, graduate-level text for advanced practice nurses and other health care professionals provides state-of-the-art tools that facilitate the reading and interpretation of clinical research articles that use increasingly complex statistical techniques. It addresses clinically relevant topics in biostatistics beyond the usual introduction to linear models, such as survival analysis and evaluation of screening tests. The text emphasizes the importance of understanding the underlying logic of statistical inference and statistical models to support correct interpretation and effective translation into practice. It promotes appropriate statistical method selection for conducting translational research. With a focus on disseminating information in easily understandable language, the text addresses basic statistical reasoning and four different classes of statistical models. The appendix provides refreshers on the algebraic underpinnings of statistics. More complex algebraic derivations are highlighted in boxes throughout the text chapters. The text explains how to work with the exponential expressions and logarithms necessary for the interpretation of logistic and hazard regression models and features clear explanations of more sophisticated statistical models, inference, and analyses. Chapters include examples from current research and multiple exercises designed to reinforce learning. Key Features: End-of-chapter exercises include both problems of interpretation and numerical problems that can be solved via hand calculations. For instructors and students interested in practical data analysis, data sets and practice problems are available from Springer Publishing Companyís website with instructions in SPSS, STATA, and SAS formats. At the end of each chapter is a ìLiterature Applicationî text box with interpretation questions about a recent research article that highlights the statistical model discussed in the chapter. Throughout the book, text boxes highlight the most important algebraic formulas useful in interpreting statistical methods. A chapter on data management practices and ethical issues of privacy maintenance is included. Nine appendices provide tables of major probability distributions, for example, normal, t- and F-distributions, and algebraic derivations of some of the most important results in statistics.
Download or read book The Prevention and Treatment of Missing Data in Clinical Trials written by National Research Council and published by National Academies Press. This book was released on 2010-12-21 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Randomized clinical trials are the primary tool for evaluating new medical interventions. Randomization provides for a fair comparison between treatment and control groups, balancing out, on average, distributions of known and unknown factors among the participants. Unfortunately, these studies often lack a substantial percentage of data. This missing data reduces the benefit provided by the randomization and introduces potential biases in the comparison of the treatment groups. Missing data can arise for a variety of reasons, including the inability or unwillingness of participants to meet appointments for evaluation. And in some studies, some or all of data collection ceases when participants discontinue study treatment. Existing guidelines for the design and conduct of clinical trials, and the analysis of the resulting data, provide only limited advice on how to handle missing data. Thus, approaches to the analysis of data with an appreciable amount of missing values tend to be ad hoc and variable. The Prevention and Treatment of Missing Data in Clinical Trials concludes that a more principled approach to design and analysis in the presence of missing data is both needed and possible. Such an approach needs to focus on two critical elements: (1) careful design and conduct to limit the amount and impact of missing data and (2) analysis that makes full use of information on all randomized participants and is based on careful attention to the assumptions about the nature of the missing data underlying estimates of treatment effects. In addition to the highest priority recommendations, the book offers more detailed recommendations on the conduct of clinical trials and techniques for analysis of trial data.
Download or read book Clinical Trials in Neurology written by Roberto J. Guiloff and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clinical Trials in Neurology comprehensively tackles the methodology and design of clinical trials in neurological disease. A general section deals with the ethical aspects, drug development and regulatory requirements, basic trial designs and the statistics used. A diseases section tackles specific aspects of disorders, focusing on the relevant ethical issues, outcome variables and experience with large multicentre trials.
