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704What Makes Time Series Data Different?
705The Four Classical Components
706Trend: Long-Term Direction
707Seasonality: Regular Periodic Patterns
708Cyclical Patterns: Non-Fixed Fluctuations
709Irregular Component: Random Noise
710Additive vs Multiplicative Models
711Visualizing Components with Decomposition Plots
712What is Stationarity?
713Why Stationarity Matters
714Types of Non-Stationarity
715Visual Tests for Stationarity
716Augmented Dickey-Fuller Test
717KPSS Test
718Interpreting Stationarity Test Results
719What is Autocorrelation?
720The Autocorrelation Function (ACF)
721Computing ACF Values
722ACF Plots and Interpretation
723Significance Bounds in ACF Plots
724ACF Patterns for Different Processes
725Decay Rates in ACF
726Using ACF for Model Identification
727What is Partial Autocorrelation?
728PACF vs ACF: Key Differences
729Calculating Partial Autocorrelations
730Interpreting PACF Plots
731PACF for AR Process Identification
732PACF Patterns for Common Models
733Using ACF and PACF Together
734Why Differencing and Detrending Matter
735First-Order Differencing
736Higher-Order Differencing
737Seasonal Differencing
738Linear Detrending
739Moving Average Detrending
740Choosing Between Differencing and Detrending
741Testing Stationarity After Transformation
742Components of Seasonal Decomposition
743Additive vs Multiplicative Models
744Classical Decomposition Methods
745STL Decomposition (Seasonal-Trend Loess)
746Choosing Seasonal Period
747Interpreting Decomposition Plots
748Seasonally Adjusted Data
749Using Decomposition for Forecasting

704What Makes Time Series Data Different?
705The Four Classical Components
706Trend: Long-Term Direction
707Seasonality: Regular Periodic Patterns
708Cyclical Patterns: Non-Fixed Fluctuations
709Irregular Component: Random Noise
710Additive vs Multiplicative Models
711Visualizing Components with Decomposition Plots
712What is Stationarity?
713Why Stationarity Matters
714Types of Non-Stationarity
715Visual Tests for Stationarity
716Augmented Dickey-Fuller Test
717KPSS Test
718Interpreting Stationarity Test Results
719What is Autocorrelation?
720The Autocorrelation Function (ACF)
721Computing ACF Values
722ACF Plots and Interpretation
723Significance Bounds in ACF Plots
724ACF Patterns for Different Processes
725Decay Rates in ACF
726Using ACF for Model Identification
727What is Partial Autocorrelation?
728PACF vs ACF: Key Differences
729Calculating Partial Autocorrelations
730Interpreting PACF Plots
731PACF for AR Process Identification
732PACF Patterns for Common Models
733Using ACF and PACF Together
734Why Differencing and Detrending Matter
735First-Order Differencing
736Higher-Order Differencing
737Seasonal Differencing
738Linear Detrending
739Moving Average Detrending
740Choosing Between Differencing and Detrending
741Testing Stationarity After Transformation
742Components of Seasonal Decomposition
743Additive vs Multiplicative Models
744Classical Decomposition Methods
745STL Decomposition (Seasonal-Trend Loess)
746Choosing Seasonal Period
747Interpreting Decomposition Plots
748Seasonally Adjusted Data
749Using Decomposition for Forecasting

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Lesson 712 of 2,145·19. Time Series FoundationsPro lesson

What is Stationarity?

Define stationarity as constant statistical properties over time, including constant mean, variance, and autocorrelation structure.

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