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Multiple prediction intervals for time series: Comparison of simultaneous and marginal intervals

✍ Scribed by N. Ravishanker; L. Shiao-yen Wu; J. Glaz

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 987 KB
Volume: 10
Category: Article
ISSN: 0277-6693
DOI: 10.1002/for.3980100502

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✦ Synopsis

Simultaneous prediction intervals for forecasts from time series models that contain L ( L 2 1) unknown future observations with a specified probability are derived. Our simultaneous intervals are based on two types of probability inequalities, i.e. the Bonferroni-and product-types. These differ from the marginal intervals in that they take into account the correlation structure between the forecast errors. For the forecasting methods commonly used with seasonal time series data, we show how to construct forecast error correlations and evaluate, using an example, the simultaneous and marginal prediction intervals. For all the methods, the simultaneous intervals are accurate with the accuracy increasing with the use of higher-order probability inequalities, whereas the marginal intervals are far too short in every case. Also, when L is greater than the seasonal period, the simultaneous intervals based on improved probability inequalities will be most accurate.

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