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Causal Effects In Non Experimental Studies
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Book Synopsis Causal Effects in Non-experimental Studies by : Rajeev Harsha Dehejia
Download or read book Causal Effects in Non-experimental Studies written by Rajeev Harsha Dehejia and published by . This book was released on 1998 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper uses propensity score methods to address the question: how well can an observational study estimate the treatment impact of a program? Using data from Lalonde's (1986) influential evaluation of non-experimental methods, we demonstrate that propensity score methods succeed in estimating the treatment impact of the National Supported Work Demonstration. Propensity score methods reduce the task of controlling for differences in pre-intervention variables between the treatment and the non-experimental comparison groups to controlling for differences in the estimated propensity score (the probability of assignment to treatment, conditional on covariates). It is difficult to control for differences in pre-intervention variables when they are numerous and when the treatment and comparison groups are dissimilar, whereas controlling for the estimated propensity score, a single variable on the unit interval, is a straightforward task. We apply several methods, such as stratification on the propensity score and matching on the propensity score, and show that they result in accurate estimates of the treatment impact.
Book Synopsis Estimating Causal Effects by : Barbara Schneider
Download or read book Estimating Causal Effects written by Barbara Schneider and published by . This book was released on 2007 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explains the value of quasi-experimental techniques that can be used to approximate randomized experiments. The goal is to describe the logic of causal inference for researchers and policymakers who are not necessarily trained in experimental and quasi-experimental designs and statistical techniques.
Author :Agency for Health Care Research and Quality (U.S.) Publisher :Government Printing Office ISBN 13 :1587634236 Total Pages :236 pages Book Rating :4.5/5 (876 download)
Book Synopsis Developing a Protocol for Observational Comparative Effectiveness Research: A User's Guide by : Agency for Health Care Research and Quality (U.S.)
Download or read book Developing a Protocol for Observational Comparative Effectiveness Research: A User's Guide written by Agency for Health Care Research and Quality (U.S.) and published by Government Printing Office. This book was released on 2013-02-21 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This User’s Guide is a resource for investigators and stakeholders who develop and review observational comparative effectiveness research protocols. It explains how to (1) identify key considerations and best practices for research design; (2) build a protocol based on these standards and best practices; and (3) judge the adequacy and completeness of a protocol. Eleven chapters cover all aspects of research design, including: developing study objectives, defining and refining study questions, addressing the heterogeneity of treatment effect, characterizing exposure, selecting a comparator, defining and measuring outcomes, and identifying optimal data sources. Checklists of guidance and key considerations for protocols are provided at the end of each chapter. The User’s Guide was created by researchers affiliated with AHRQ’s Effective Health Care Program, particularly those who participated in AHRQ’s DEcIDE (Developing Evidence to Inform Decisions About Effectiveness) program. Chapters were subject to multiple internal and external independent reviews. More more information, please consult the Agency website: www.effectivehealthcare.ahrq.gov)
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309392527 Total Pages :273 pages Book Rating :4.3/5 (93 download)
Book Synopsis Commercial Motor Vehicle Driver Fatigue, Long-Term Health, and Highway Safety by : National Academies of Sciences, Engineering, and Medicine
Download or read book Commercial Motor Vehicle Driver Fatigue, Long-Term Health, and Highway Safety written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-09-12 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are approximately 4,000 fatalities in crashes involving trucks and buses in the United States each year. Though estimates are wide-ranging, possibly 10 to 20 percent of these crashes might have involved fatigued drivers. The stresses associated with their particular jobs (irregular schedules, etc.) and the lifestyle that many truck and bus drivers lead, puts them at substantial risk for insufficient sleep and for developing short- and long-term health problems. Commercial Motor Vehicle Driver Fatigue, Long-Term Health and Highway Safety assesses the state of knowledge about the relationship of such factors as hours of driving, hours on duty, and periods of rest to the fatigue experienced by truck and bus drivers while driving and the implications for the safe operation of their vehicles. This report evaluates the relationship of these factors to drivers' health over the longer term, and identifies improvements in data and research methods that can lead to better understanding in both areas.
Book Synopsis Causality in a Social World by : Guanglei Hong
Download or read book Causality in a Social World written by Guanglei Hong and published by John Wiley & Sons. This book was released on 2015-08-17 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: Causality in a Social World introduces innovative new statistical research and strategies for investigating moderated intervention effects, mediated intervention effects, and spill-over effects using experimental or quasi-experimental data. The book uses potential outcomes to define causal effects, explains and evaluates identification assumptions using application examples, and compares innovative statistical strategies with conventional analysis methods. Whilst highlighting the crucial role of good research design and the evaluation of assumptions required for identifying causal effects in the context of each application, the author demonstrates that improved statistical procedures will greatly enhance the empirical study of causal relationship theory. Applications focus on interventions designed to improve outcomes for participants who are embedded in social settings, including families, classrooms, schools, neighbourhoods, and workplaces.
Book Synopsis From Neurons to Neighborhoods by : National Research Council
Download or read book From Neurons to Neighborhoods written by National Research Council and published by National Academies Press. This book was released on 2000-11-13 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: How we raise young children is one of today's most highly personalized and sharply politicized issues, in part because each of us can claim some level of "expertise." The debate has intensified as discoveries about our development-in the womb and in the first months and years-have reached the popular media. How can we use our burgeoning knowledge to assure the well-being of all young children, for their own sake as well as for the sake of our nation? Drawing from new findings, this book presents important conclusions about nature-versus-nurture, the impact of being born into a working family, the effect of politics on programs for children, the costs and benefits of intervention, and other issues. The committee issues a series of challenges to decision makers regarding the quality of child care, issues of racial and ethnic diversity, the integration of children's cognitive and emotional development, and more. Authoritative yet accessible, From Neurons to Neighborhoods presents the evidence about "brain wiring" and how kids learn to speak, think, and regulate their behavior. It examines the effect of the climate-family, child care, community-within which the child grows.
Book Synopsis Causal Analysis in Population Studies by : Henriette Engelhardt
Download or read book Causal Analysis in Population Studies written by Henriette Engelhardt and published by Springer Science & Business Media. This book was released on 2009-05-05 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: The central aim of many studies in population research and demography is to explain cause-effect relationships among variables or events. For decades, population scientists have concentrated their efforts on estimating the ‘causes of effects’ by applying standard cross-sectional and dynamic regression techniques, with regression coefficients routinely being understood as estimates of causal effects. The standard approach to infer the ‘effects of causes’ in natural sciences and in psychology is to conduct randomized experiments. In population studies, experimental designs are generally infeasible. In population studies, most research is based on non-experimental designs (observational or survey designs) and rarely on quasi experiments or natural experiments. Using non-experimental designs to infer causal relationships—i.e. relationships that can ultimately inform policies or interventions—is a complex undertaking. Specifically, treatment effects can be inferred from non-experimental data with a counterfactual approach. In this counterfactual perspective, causal effects are defined as the difference between the potential outcome irrespective of whether or not an individual had received a certain treatment (or experienced a certain cause). The counterfactual approach to estimate effects of causes from quasi-experimental data or from observational studies was first proposed by Rubin in 1974 and further developed by James Heckman and others. This book presents both theoretical contributions and empirical applications of the counterfactual approach to causal inference.
Author :Hubert M. Blalock Publisher :Chapel Hill : University of North Carolina Press ISBN 13 : Total Pages :222 pages Book Rating :4.3/5 (91 download)
Book Synopsis Causal Inferences in Nonexperimental Research by : Hubert M. Blalock
Download or read book Causal Inferences in Nonexperimental Research written by Hubert M. Blalock and published by Chapel Hill : University of North Carolina Press. This book was released on 1964 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taking an exploratory rather than a dogmatic approach to the problem, this book pulls together materials bearing on casual inference that are widely scattered in the philosophical, statistical, and social science literature. It is written in nonmathematical terms, and it is imaginative and sophisticated from both a theoretical and a statistical point of view. Originally published in 1964. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.
Book Synopsis Encyclopedia of Research Design by : Neil J. Salkind
Download or read book Encyclopedia of Research Design written by Neil J. Salkind and published by SAGE. This book was released on 2010-06-22 with total page 1779 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Comprising more than 500 entries, the Encyclopedia of Research Design explains how to make decisions about research design, undertake research projects in an ethical manner, interpret and draw valid inferences from data, and evaluate experiment design strategies and results. Two additional features carry this encyclopedia far above other works in the field: bibliographic entries devoted to significant articles in the history of research design and reviews of contemporary tools, such as software and statistical procedures, used to analyze results. It covers the spectrum of research design strategies, from material presented in introductory classes to topics necessary in graduate research; it addresses cross- and multidisciplinary research needs, with many examples drawn from the social and behavioral sciences, neurosciences, and biomedical and life sciences; it provides summaries of advantages and disadvantages of often-used strategies; and it uses hundreds of sample tables, figures, and equations based on real-life cases."--Publisher's description.
Download or read book Estimating Causal Effects written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experiments in Public Management Research by : Oliver James
Download or read book Experiments in Public Management Research written by Oliver James and published by Cambridge University Press. This book was released on 2017-07-27 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of experimental research and methods in public management, and their impact on theory, research practices and substantive knowledge.
Book Synopsis Robust Randomized Experiments for Causal Effects Under Privacy by : Manjusha Kancharla
Download or read book Robust Randomized Experiments for Causal Effects Under Privacy written by Manjusha Kancharla and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses inference problems in randomized experiments where the assumption that participants are willing to share their (potentially sensitive) response to treatment with the investigator may not be valid. Randomized control trials (RCTs) have been the gold standard to estimate the average causal effect of a treatment on a response. However, when the true response to treatment is not available, RCTs cannot estimate the true causal effects. This thesis presents a simple, differentially private experimental design, one of the strongest notions of data privacy in computer science. Simply put, the data collected from the design proposed in this thesis is information-theoretically guaranteed to be genuinely anonymous; the same guarantee does not exist for a traditional RCT where an adversary can potentially identify individual patients based on data from the RCT. Critically, the proposed design's strong guarantee of data privacy enables individual-level data to be publicly shared for scientific replication. This thesis also uses works on non-compliance in experimental psychology to make our design robust against ``adversarial'' study participants who may distrust the investigator with their data and provide contaminated responses to intentionally bias the study results. Under the new design, this thesis proposes unbiased and asymptotically Normal estimators for the average treatment effect. Additionally, this thesis presents a doubly robust estimator that leverages pre-treatment covariates, if available, to improve efficiency. This thesis also offers a simple method to make our design robust against ``adversarial'' study participants even with small sample sizes. Through several simulation studies, this thesis demonstrates the asymptotic and finite sample behavior of the proposed estimation procedures. Finally, this thesis discusses an application of the proposed design in a setting where sensitive student data is collected. Specifically, we evaluate different modes of learning in online statistics courses at the University of Wisconsin-Madison while guaranteeing data privacy.
Book Synopsis Microeconometrics by : Steven Durlauf
Download or read book Microeconometrics written by Steven Durlauf and published by Springer. This book was released on 2016-06-07 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specially selected from The New Palgrave Dictionary of Economics 2nd edition, each article within this compendium covers the fundamental themes within the discipline and is written by a leading practitioner in the field. A handy reference tool.
Book Synopsis Experimental and Quasi-experimental Designs for Generalized Causal Inference by : William R. Shadish
Download or read book Experimental and Quasi-experimental Designs for Generalized Causal Inference written by William R. Shadish and published by Cengage Learning. This book was released on 2002 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections include: experiments and generalised causal inference; statistical conclusion validity and internal validity; construct validity and external validity; quasi-experimental designs that either lack a control group or lack pretest observations on the outcome; quasi-experimental designs that use both control groups and pretests; quasi-experiments: interrupted time-series designs; regresssion discontinuity designs; randomised experiments: rationale, designs, and conditions conducive to doing them; practical problems 1: ethics, participation recruitment and random assignment; practical problems 2: treatment implementation and attrition; generalised causal inference: a grounded theory; generalised causal inference: methods for single studies; generalised causal inference: methods for multiple studies; a critical assessment of our assumptions.
Book Synopsis Econometric Evaluation of Labour Market Policies by : Michael Lechner
Download or read book Econometric Evaluation of Labour Market Policies written by Michael Lechner and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Empirical measurement of impacts of active labour market programmes has started to become a central task of economic researchers. New improved econometric methods have been developed that will probably influence future empirical work in various other fields of economics as well. This volume contains a selection of original papers from leading experts, among them James J. Heckman, Noble Prize Winner 2000 in economics, addressing these econometric issues at the theoretical and empirical level. The theoretical part contains papers on tight bounds of average treatment effects, instrumental variables estimators, impact measurement with multiple programme options and statistical profiling. The empirical part provides the reader with econometric evaluations of active labour market programmes in Canada, Germany, France, Italy, Slovak Republic and Sweden.
Book Synopsis Causal Modelling in Nonexperimental Research by : Willem E. Saris
Download or read book Causal Modelling in Nonexperimental Research written by Willem E. Saris and published by . This book was released on 1984 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of variance has become a major tool for causal analyses in experimental research. Covariance structure analysis is increasingly taking this place in the nonexperimental sciences. Apart from the data analysis itself, the specification of models play a very important role in this approach. This book introduces both aspects of covariance structure analysis. In doing so an effort is made to link up the older path analysis approach which the new and more powerful LISREL approach. All of the relevant aspects of the approach are covered at an introductory level. The prior level of mathematical or statistical knowledge is very limited (knowledge of some descriptions is convenient, but no matrix algebra is required). The procedures are illustrated by concrete data analyses using the LISREL computer program, but the text does not depend on the use of this particular program.
Book Synopsis Propensity Score Matching Methods for Non-experimental Causal Studies by : Rajeev H. Dehejia
Download or read book Propensity Score Matching Methods for Non-experimental Causal Studies written by Rajeev H. Dehejia and published by . This book was released on 1998 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper considers causal inference and sample selection bias in non-experimental settings in which: (i) few units in the non-experimental comparison group are comparable to the treatment units, and (ii) selecting a subset of comparison units similar to the treatment units is difficult because units must be compared across a high-dimensional set of pre-treatment characteristics. We propose the use of propensity score matching methods and implement them using data from the NSW experiment. Following Lalonde (1986), we pair the experimental treated units with non-experimental comparison units from the CPS and PSID and compare the estimates of the treatment effect obtained using our methods to the benchmark results from the experiment. We show that the methods succeed in focusing attention on the small subset of the comparison units comparable to the treated units and, hence, in alleviating the bias due to systematic differences between the treated and comparison units.
