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- W2609408510 abstract "The problem of estimating trend and seasonal variation in time-series data has been studied over several decades, although mostly using single time series. This paper studies the problem of estimating these components from functional data, i.e. multiple time series, in situations where seasonal effects exhibit arbitrary time warpings or phase variability across different observations. Rather than ignoring the phase variability, or using an off-the-shelf alignment method to remove phase, we take a model-based approach and seek MLEs of the trend and the seasonal effects, while performing alignments over the seasonal effects at the same time. The MLEs of trend, seasonality, and phase are computed using a coordinate-descent based optimization method. We use bootstrap replication for computing confidence bands and for testing hypothesis about the estimated components. We also utilize log-likelihood for selecting the trend subspace, and for comparisons with other candidate models. This framework is demonstrated using experiments involving synthetic data and three real data (Berkeley Growth Velocity, U.S. electricity price, and USD exchange fluctuation)." @default.
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- W2609408510 date "2017-04-24" @default.
- W2609408510 modified "2023-09-27" @default.
- W2609408510 title "Trend and Variable-Phase Seasonality Estimation from Functional Data" @default.
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