Σύγκριση μεθόδων

	Εποχική προσαρμογή X-13ARIMA-SEATS	Μοντέλο ARIMA (Autoregressive Integrated Moving Average)	Αποσύνθεση STL: Αποσύνθεση Εποχικότητας-Τάσης με χρήση Loess
Πεδίο	Οικονομετρία	Οικονομετρία	Οικονομετρία
Οικογένεια	Process / pipeline	Regression model	Process / pipeline
Έτος προέλευσης	1998	2015	1990
Δημιουργός	U.S. Census Bureau; Findley et al.	Box & Jenkins (Box-Jenkins methodology)	Cleveland, Cleveland, McRae & Terpenning
Τύπος	Non-parametric / model-based hybrid	Univariate time-series model	nonparametric iterative smoother
Θεμελιώδης πηγή	Findley, D. F., Monsell, B. C., Bell, W. R., Otto, M. C., & Chen, B.-C. (1998). New capabilities and methods of the X-12-ARIMA seasonal adjustment program. Journal of Business & Economic Statistics, 16(2), 127–152.	Box, G. E. P., Jenkins, G. M., Reinsel, G. C. & Ljung, G. M. (2015). Time Series Analysis: Forecasting and Control (5th ed.). Wiley. ISBN: 978-1118675021	Cleveland, R. B., Cleveland, W. S., McRae, J. E., & Terpenning, I. (1990). STL: A seasonal-trend decomposition procedure based on loess. Journal of Official Statistics, 6(1), 3–73.
Εναλλακτικές ονομασίες	X-13ARIMA-SEATS, X-12-ARIMA, Census X-13, Mevsimsel Düzeltme X-13	Box-Jenkins model, ARIMA(p,d,q), ARIMA Modeli	Seasonal-Trend Decomposition using Loess, STL filtering, Loess-based seasonal decomposition, Mevsimsel-Trend Ayrıştırma (STL)
Συναφείς	3	5	3
Σύνοψη	X-13ARIMA-SEATS is the standard seasonal adjustment program produced by the U.S. Census Bureau, combining RegARIMA pre-adjustment with either the classical X-11 filter or the model-based SEATS signal-extraction algorithm. It is the official tool used by national statistical agencies worldwide — including Eurostat and the U.S. Bureau of Labor Statistics — to remove recurring calendar and seasonal patterns from monthly or quarterly economic time series such as GDP, employment, and retail sales.	ARIMA is a univariate time-series forecasting model that combines autoregressive, integrated (differencing), and moving-average components to predict a single continuous series from its own past. It is the centrepiece of the Box-Jenkins methodology set out in Box, Jenkins, Reinsel & Ljung's Time Series Analysis (5th ed., 2015).	STL Decomposition, introduced by Cleveland, Cleveland, McRae, and Terpenning (1990), is a nonparametric procedure that separates a time series into three additive components — trend, seasonal, and remainder — using iterative locally weighted regression (loess). Widely used in economics, meteorology, and data science, it handles time series of any periodicity and is robust to the presence of outliers, making it a highly flexible alternative to classical decomposition methods.