When a time series exhibits seasonal variations, the Holt exponential smoothing method, or double exponential smoothing method, is appropriate to capture the upward and downward movement of the time series.

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The Holt exponential smoothing method, or double exponential smoothing, is designed to forecast data with trends but does not directly account for seasonality. For seasonal variations, the Holt-Winters method, which extends Holt's method by adding a seasonal component, is more appropriate.

When a Time Series Exhibits Seasonal Variations, the Holt Exponential