This book appeals to practitioners in government institutions, finance and business, macroeconomists, and other professionals who use economic data as well as academic researchers in time series analysis, seasonal adjustment methods, filtering and signal extraction. It is also useful for graduate and final-year undergraduate courses in econometrics and time series with a good understanding of linear regression and matrix algebra, as well as ARIMA modelling.
Estela Bee Dagum is currently a Research Professor of the Department of Statistical Sciences of the University of Bologna, Italy where she was a Full Professor for 10 years until 2007 (appointed by Chiara Fama, an Italian system for appointing internationally recognized scientists of the very highest caliber). From 2007 until December 2009 she was appointed as Alumna of the Business Survey and Methodology Division at Statistics Canada to serve as a consultant on time series issues, particularly on linkage, benchmarking, trend and seasonal adjustment. Previously, Estelle Bee Dagum was Director of the Time Series Research and Analysis Centre of Statistics Canada where she worked for 21 years (1972-1993). In 1980, she developed the X11ARIMA seasonal adjustment method, later modified to X12ARIMA, which is currently used by most of the world’s statistical agencies. In 1994, she jointly developed a benchmarking regression method that is currently used by Statistics Canada and other agencies for benchmarking, interpolation, linkage and reconciliation of time series systems. Estelle Bee Dagum has served as a consultant to a large number of governments and private entities, published 19 books on time series analysis related topics, and more than 150 papers in leading scientific and statistical journals.
Silvia Bianconcini is an Associate Professor at the Department of Statistical Sciences, University of Bologna, where she received her PhD on Statistical Methodology for the Scientific Research. Her main research interests are time series analysis with an emphasis on signal extraction, longitudinal data analysis based on latent variable models, and statistical inference of generalized linear models.
This book focuses on imitating analyses that are based on variance by replacing variance with the GMD and its variants. In this way, the text showcases how almost everything that can be done with the variance as a measure of variability, can be replicated by using Gini. Beyond this, there are marked benefits to utilizing Gini as opposed to other methods. One of the advantages of using Gini methodology is that it provides a unified system that enables the user to learn about various aspects of the underlying distribution. It also provides a systematic method and a unified terminology.
Using Gini methodology can reduce the risk of imposing assumptions that are not supported by the data on the model. With these benefits in mind the text uses the covariance-based approach, though applications to other approaches are mentioned as well.
A common misconception is that time series data originate from the direct and straightforward compilations of survey data, censuses, and administrative records. On the contrary, before publication time series are subject to statistical adjustments intended to facilitate analysis, increase efficiency, reduce bias, replace missing values, correct errors, and satisfy cross-sectional additivity constraints. Some of the most common adjustments are benchmarking, interpolation, temporal distribution, calendarization, and reconciliation.
This book discusses the statistical methods most often applied for such adjustments, ranging from ad hoc procedures to regression-based models. The latter are emphasized, because of their clarity, ease of application, and superior results. Each topic is illustrated with many real case examples. In order to facilitate understanding of their properties and limitations of the methods discussed, a real data example, the Canada Total Retail Trade Series, is followed throughout the book.
This book brings together the scattered literature on these topics and presents them using a consistent notation and a unifying view. The book will promote better procedures by large producers of time series, e.g. statistical agencies and central banks. Furthermore, knowing what adjustments are made to the data and what technique is used and how they affect the trend, the business cycles and seasonality of the series, will enable users to perform better modeling, prediction, analysis and planning.
This book will prove useful to graduate students and final year undergraduate students of time series and econometrics, as well as researchers and practitioners in government institutions and business.
From the reviews:
"It is an excellent reference book for people working in this area." B. Abraham for Short Book Reviews of the ISI, December 2006
Once considered tedious, the field of statistics is rapidly evolving into a discipline Hal Varian, chief economist at Google, has actually called "sexy." From batting averages and political polls to game shows and medical research, the real-world application of statistics continues to grow by leaps and bounds. How can we catch schools that cheat on standardized tests? How does Netflix know which movies you’ll like? What is causing the rising incidence of autism? As best-selling author Charles Wheelan shows us in Naked Statistics, the right data and a few well-chosen statistical tools can help us answer these questions and more.
For those who slept through Stats 101, this book is a lifesaver. Wheelan strips away the arcane and technical details and focuses on the underlying intuition that drives statistical analysis. He clarifies key concepts such as inference, correlation, and regression analysis, reveals how biased or careless parties can manipulate or misrepresent data, and shows us how brilliant and creative researchers are exploiting the valuable data from natural experiments to tackle thorny questions.
And in Wheelan’s trademark style, there’s not a dull page in sight. You’ll encounter clever Schlitz Beer marketers leveraging basic probability, an International Sausage Festival illuminating the tenets of the central limit theorem, and a head-scratching choice from the famous game show Let’s Make a Deal—and you’ll come away with insights each time. With the wit, accessibility, and sheer fun that turned Naked Economics into a bestseller, Wheelan defies the odds yet again by bringing another essential, formerly unglamorous discipline to life.