Dataset = Sales Report Indihome PematangSiantar
Times = January 2018 until December 2021
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Double Moving Average is best models for historical data with a trend but no seasonality.
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Double Eksponensial Smoothing is best models for data have a trend and do not have a seasonal component.
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DMA and DES are suitable for short-term forecasting
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Exploratory Data Analysis by monthly, analysis and forecasting are carried out by comparing MAPE
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Summary = MAPE DMA < MAPE DES with optimal parameter