Question: When calculating error measures for a Holt - Winters model it is customary to Ignore the first year of calculation ( which is based on

When calculating error measures for a Holt-Winters model it is customary to
Ignore the first year of calculation (which is based on initialized seasonal factors)
Ignore the first 4 periods
Ignore all periods with negative trend
Ignore periods where the error is negative
When calculating error measures for a Holt-Winters model it is customary

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