Changepoints
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Author | : Vyacheslav Lyubchich |
Publisher | : CRC Press |
Total Pages | : 322 |
Release | : 2020-10-07 |
Genre | : Mathematics |
ISBN | : 1351190814 |
Evaluating Climate Change Impacts discusses assessing and quantifying climate change and its impacts from a multi-faceted perspective of ecosystem, social, and infrastructure resilience, given through a lens of statistics and data science. It provides a multi-disciplinary view on the implications of climate variability and shows how the new data science paradigm can help us to mitigate climate-induced risk and to enhance climate adaptation strategies. This book consists of chapters solicited from leading topical experts and presents their perspectives on climate change effects in two general areas: natural ecosystems and socio-economic impacts. The chapters unveil topics of atmospheric circulation, climate modeling, and long-term prediction; approach the problems of increasing frequency of extreme events, sea level rise, and forest fires, as well as economic losses, analysis of climate impacts for insurance, agriculture, fisheries, and electric and transport infrastructures. The readers will be exposed to the current research using a variety of methods from physical modeling, statistics, and machine learning, including the global circulation models (GCM) and ocean models, statistical generalized additive models (GAM) and generalized linear models (GLM), state space and graphical models, causality networks, Bayesian ensembles, a variety of index methods and statistical tests, and machine learning methods. The reader will learn about data from various sources, including GCM and ocean model outputs, satellite observations, and data collected by different agencies and research units. Many of the chapters provide references to open source software R and Python code that are available for implementing the methods.
Author | : Greg Rafferty |
Publisher | : Packt Publishing Ltd |
Total Pages | : 282 |
Release | : 2023-03-31 |
Genre | : Computers |
ISBN | : 1837635501 |
Create and improve fully automated forecasts for time series data with strong seasonal effects, holidays, and additional regressors using Python Purchase of the print or Kindle book includes a free PDF eBook Key Features Explore Prophet, the open source forecasting tool developed at Meta, to improve your forecasts Create a forecast and run diagnostics to understand forecast quality Fine-tune models to achieve high performance and report this performance with concrete statistics Book DescriptionForecasting Time Series Data with Prophet will help you to implement Prophet's cutting-edge forecasting techniques to model future data with high accuracy using only a few lines of code. This second edition has been fully revised with every update to the Prophet package since the first edition was published two years ago. An entirely new chapter is also included, diving into the mathematical equations behind Prophet's models. Additionally, the book contains new sections on forecasting during shocks such as COVID, creating custom trend modes from scratch, and a discussion of recent developments in the open-source forecasting community. You'll cover advanced features such as visualizing forecasts, adding holidays and trend changepoints, and handling outliers. You'll use the Fourier series to model seasonality, learn how to choose between an additive and multiplicative model, and understand when to modify each model parameter. Later, you'll see how to optimize more complicated models with hyperparameter tuning and by adding additional regressors to the model. Finally, you'll learn how to run diagnostics to evaluate the performance of your models in production. By the end of this book, you'll be able to take a raw time series dataset and build advanced and accurate forecasting models with concise, understandable, and repeatable code.What you will learn Understand the mathematics behind Prophet’s models Build practical forecasting models from real datasets using Python Understand the different modes of growth that time series often exhibit Discover how to identify and deal with outliers in time series data Find out how to control uncertainty intervals to provide percent confidence in your forecasts Productionalize your Prophet models to scale your work faster and more efficiently Who this book is forThis book is for business managers, data scientists, data analysts, machine learning engineers, and software engineers who want to build time-series forecasts in Python or R. To get the most out of this book, you should have a basic understanding of time series data and be able to differentiate it from other types of data. Basic knowledge of forecasting techniques is a plus.
Author | : Jie Chen |
Publisher | : Springer Science & Business Media |
Total Pages | : 190 |
Release | : 2013-11-11 |
Genre | : Mathematics |
ISBN | : 1475731310 |
Recently there has been a keen interest in the statistical analysis of change point detec tion and estimation. Mainly, it is because change point problems can be encountered in many disciplines such as economics, finance, medicine, psychology, geology, litera ture, etc. , and even in our daily lives. From the statistical point of view, a change point is a place or time point such that the observations follow one distribution up to that point and follow another distribution after that point. Multiple change points problem can also be defined similarly. So the change point(s) problem is two fold: one is to de cide if there is any change (often viewed as a hypothesis testing problem), another is to locate the change point when there is a change present (often viewed as an estimation problem). The earliest change point study can be traced back to the 1950s. During the fol lowing period of some forty years, numerous articles have been published in various journals and proceedings. Many of them cover the topic of single change point in the means of a sequence of independently normally distributed random variables. Another popularly covered topic is a change point in regression models such as linear regres sion and autoregression. The methods used are mainly likelihood ratio, nonparametric, and Bayesian. Few authors also considered the change point problem in other model settings such as the gamma and exponential.
Author | : Greg Rafferty |
Publisher | : Packt Publishing Ltd |
Total Pages | : 270 |
Release | : 2021-03-12 |
Genre | : Computers |
ISBN | : 1800566522 |
Create and improve high-quality automated forecasts for time series data that have strong seasonal effects, holidays, and additional regressors using Python Key Features Learn how to use the open-source forecasting tool Facebook Prophet to improve your forecasts Build a forecast and run diagnostics to understand forecast quality Fine-tune models to achieve high performance, and report that performance with concrete statistics Book Description Prophet enables Python and R developers to build scalable time series forecasts. This book will help you to implement Prophet's cutting-edge forecasting techniques to model future data with higher accuracy and with very few lines of code. You will begin by exploring the evolution of time series forecasting, from the basic early models to the advanced models of the present day. The book will demonstrate how to install and set up Prophet on your machine and build your first model with only a few lines of code. You'll then cover advanced features such as visualizing your forecasts, adding holidays, seasonality, and trend changepoints, handling outliers, and more, along with understanding why and how to modify each of the default parameters. Later chapters will show you how to optimize more complicated models with hyperparameter tuning and by adding additional regressors to the model. Finally, you'll learn how to run diagnostics to evaluate the performance of your models and see some useful features when running Prophet in production environments. By the end of this Prophet book, you will be able to take a raw time series dataset and build advanced and accurate forecast models with concise, understandable, and repeatable code. What you will learn Gain an understanding of time series forecasting, including its history, development, and uses Understand how to install Prophet and its dependencies Build practical forecasting models from real datasets using Python Understand the Fourier series and learn how it models seasonality Decide when to use additive and when to use multiplicative seasonality Discover how to identify and deal with outliers in time series data Run diagnostics to evaluate and compare the performance of your models Who this book is for This book is for data scientists, data analysts, machine learning engineers, software engineers, project managers, and business managers who want to build time series forecasts in Python. Working knowledge of Python and a basic understanding of forecasting principles and practices will be useful to apply the concepts covered in this book more easily.
Author | : David Barber |
Publisher | : Cambridge University Press |
Total Pages | : 432 |
Release | : 2011-08-11 |
Genre | : Computers |
ISBN | : 0521196760 |
The first unified treatment of time series modelling techniques spanning machine learning, statistics, engineering and computer science.
Author | : E. Brodsky |
Publisher | : Springer Science & Business Media |
Total Pages | : 221 |
Release | : 2013-03-14 |
Genre | : Mathematics |
ISBN | : 9401581630 |
The explosive development of information science and technology puts in new problems involving statistical data analysis. These problems result from higher re quirements concerning the reliability of statistical decisions, the accuracy of math ematical models and the quality of control in complex systems. A new aspect of statistical analysis has emerged, closely connected with one of the basic questions of cynergetics: how to "compress" large volumes of experimental data in order to extract the most valuable information from data observed. De tection of large "homogeneous" segments of data enables one to identify "hidden" regularities in an object's behavior, to create mathematical models for each seg ment of homogeneity, to choose an appropriate control, etc. Statistical methods dealing with the detection of changes in the characteristics of random processes can be of great use in all these problems. These methods have accompanied the rapid growth in data beginning from the middle of our century. According to a tradition of more than thirty years, we call this sphere of statistical analysis the "theory of change-point detection. " During the last fifteen years, we have witnessed many exciting developments in the theory of change-point detection. New promising directions of research have emerged, and traditional trends have flourished anew. Despite this, most of the results are widely scattered in the literature and few monographs exist. A real need has arisen for up-to-date books which present an account of important current research trends, one of which is the theory of non parametric change--point detection.
Author | : Stephen Walter Gulyas |
Publisher | : |
Total Pages | : 722 |
Release | : 1998 |
Genre | : |
ISBN | : |
Author | : Matthew P. Reynolds |
Publisher | : CABI |
Total Pages | : 310 |
Release | : 2010 |
Genre | : Science |
ISBN | : 1845936337 |
Agricultural, botanical, and social scientists from the four quarters of the world address the impact of climate change on crop productivity, some approaches to adapt plants to both biotic and abiotic stresses, and measures to reduce greenhouse gases. They cover predictions of climate change within the context of agriculture, adapting to biotic and abiotic stresses through crop breeding, sustainable and resource-conserving technologies for adapting to and mitigating climate change, and new tools for enhancing crop adaptation to climate change. Specific topics include economic impacts of climate change on agriculture to 2030, breeding for adaptation to heat and drought stress, managing resident soil microbial community structure and function to suppress the development of soil-borne diseases, and applying geographical information systems (GIS) and crop simulation modeling in climate change research.
Author | : Boris Brodsky |
Publisher | : CRC Press |
Total Pages | : 366 |
Release | : 2016-12-12 |
Genre | : Mathematics |
ISBN | : 1498755976 |
This book covers the development of methods for detection and estimation of changes in complex systems. These systems are generally described by nonstationary stochastic models, which comprise both static and dynamic regimes, linear and nonlinear dynamics, and constant and time-variant structures of such systems. It covers both retrospective and sequential problems, particularly theoretical methods of optimal detection. Such methods are constructed and their characteristics are analyzed both theoretically and experimentally. Suitable for researchers working in change-point analysis and stochastic modelling, the book includes theoretical details combined with computer simulations and practical applications. Its rigorous approach will be appreciated by those looking to delve into the details of the methods, as well as those looking to apply them.
Author | : Patrick C. Flood |
Publisher | : John Wiley & Sons |
Total Pages | : 256 |
Release | : 2013-09-18 |
Genre | : Business & Economics |
ISBN | : 1118741773 |
"5 stars: Exceptional, a must read for any manager or leader" —Sarah Stocks, Chartered Management Institute (CMI) "This book is a highly effective, meaningful and user-friendly guide for anyone trying to manage change in a modern organisation today" —inManagement magazine "If you are looking for a book to give you some hints and tips as to how to manage change better, this will be able to do this. [...] There are some great insights for anyone who is responsible for leading change" —Kyomi Wade, Dialogue Review Real stories from real CEOs on implementing successful change initiatives in any organization Change is difficult. In large organizations with established cultures, managing change can be one of the biggest challenges for business leaders and managers. Using a wealth of real stories from real CEOs on how they managed major change initiatives—and the lessons they learned along the way—Change Lessons from a CEO gives professionals and business students powerful and effective guidance on successfully managing change initiatives in any organization. The book's uniquely flexible approach lets readers build their own models for change based on their unique organizational structure, culture, and situation. Throughout, the book emphasizes the importance of authenticity in the change leader's role and how to manifest that authenticity throughout a change initiative. With examples and case studies from multinational corporations, non-governmental organizations, and small and medium-size businesses, this book is a valuable tool for leaders of any organization of any size. Offers real-world insight from CEOs and leaders Ideal for CEOs, managers, leaders of non-profit organizations, consultants, and students in business programs Includes case studies and first-hand accounts of successful change initiatives in a wide range of businesses and organizations of all sizes Change is inevitable. Managing change initiatives successfully can be the difference between organizations and teams that thrive and those that come apart at the seams. For business leaders and students, this book offers practical and proven guidance for doing change right.