93. 预测的准确性与时机050010001500200025003000350040000500100015002000250030003500400005001000150020002500300035004000050010001500200025003000350040000500100015002000250030003500400005001000150020002500300035004000初始预测量 观测到总销售20%后的修正预测量 观测到总销售80%后的修正预测量实际销售量Each data point represents the forecast and the actual season sales for a particular item (at the style-color level).