Question: What is the explanation for why the average forecasting errors were higher for the other time- series forecasting methods than for the supposedly less powerful

What is the explanation for why the average forecasting errors were higher for the other time- series forecasting methods than for the supposedly less powerful last-value method?

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What is the explanation for why the average forecasting errors were higher for the other time series forecasting methods than for the supposedly less powerful last-value method?

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