P_Methods.qmd

# Methods {.unnumbered #part-M}

This part provides underlying methodological background on all the algorithms featured in JDemetra+. 

Practical guidance on how to use these algorithms can be found [here](#part-A), whereas detailed description of all the available tools allowing to use them can be found in the [Tools](#part-T) part of this book.

In this part: 

-   [Spectral analysis tools](#m-spectrum)

-   [Tests for seasonality and residuals](M-tests.qmd)

-   [Reg-Arima modelling](#m-reg-a)

-   [X-11: moving average based decomposition](#m-X11)

-   [SEATS: Arima model based decomposition](#m-seats)

-   [STL: Loess based decomposition](#m-stl)

-   [Structural time series and state space framework](#m-ssf)

-   [Seasonal Adjustment of High-Frequency Data](#m-sa-hf)

-   [Trend Estimation](#m-trend)

-   [Benchmarking and temporal disaggregation](m-bench)