Download An Introduction to Time Series Analysis and Forecasting: by Robert Alan Yaffee, Monnie McGee PDF

By Robert Alan Yaffee, Monnie McGee

Supplying a transparent clarification of the elemental thought of time sequence research and forecasting, this booklet thought with functions of 2 renowned statistical packages--SAS and SPSS. The textual content examines relocating usual, exponential smoothing, Census X-11 deseasonalization, ARIMA, intervention, move functionality, and autoregressive mistakes versions and has short discussions of ARCH and GARCH versions. The publication positive factors remedies of forecast development with regression and autoregression blend versions and version and forecast evaluate, besides a pattern dimension research for universal time sequence types to achieve sufficient statistical strength. to augment the book's price as a instructing instrument, the knowledge units and courses utilized in the publication are made to be had at the educational Press website. The cautious linkage of the theoretical constructs with the sensible concerns eager about using the statistical applications makes it effortless for the person to correctly observe those strategies.

Key Features
* Describes imperative methods to time sequence research and forecasting
* provides examples from public opinion examine, coverage research, political technology, economics, and sociology
* unfastened site comprises the information utilized in such a lot chapters, facilitating learning
* Math point pitched to common social technological know-how usage
* word list makes the cloth available for readers in any respect degrees

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Extra info for An Introduction to Time Series Analysis and Forecasting: With Applications of SAS® and SPSS®

Sample text

The first moving average is of order T. A second moving average, made up of the components of the first moving average, is of order N. In other words, the double moving average takes the average of N of the first moving averages. The double moving average begins T ϩ N time points after the beginning of the first point in the series. It results in more smoothing of the first smoothing moving average. The extent of this smoothing depends on the lengths of the first and second moving average. For long series, with much irregularity or incremental error, this kind of smoothing facilitates elimination of shortrun fluctuations.

A line of demarcation separates the actual from the predicted values. Single exponential smoothing is advantageous for forecasting under particular circumstances. It is a simple form of moving average model. 3 A single exponential smoothing of free inventory space (SPSS Chart). 32 2/Extrapolative Models and Decomposition Models models lack trend or seasonality, and they do not require a long series for prediction. They are easy to program and can be run with a spreadsheet by those who understand the process.

SAMPLE SIZE As a rule, the series should contain enough observations for proper parameter estimation. There seems to be no hard and fast rule about the minimum size. Some authors say at least 30 observations are needed. Others say 50, and others indicate that there should be at least 60 observations. 4 1/Introduction and Overview If the series includes cycles, then it should span enough cycles to precisely model them. If the series possesses seasonality, it should span enough seasons to model them accurately; thus, seasonal processes need more observations than nonseasonal ones.

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