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The package provides multivariate time series models for structural analysis,allowing one to extract latent signals such as trends or seasonality. Modelsare fitted using maximum likelihood estimation, allowing for non-stationarity,fixed regression effects, and ragged-edge missing values. Simple types ofextreme values can be corrected using the device of entropy maximization. Modeladequacy is assessed through residual diagnostics, and model-based signalextraction filters can be assessed in time domain and frequency domain.Extracted signals are produced with uncertainty measures that account forsample edge effects and missing values, and the signals (as well as theoriginal time series) can be forecasted.

Ecce Signum: An R Package for Multivariate Signal Extraction and Time Series Analysis