This paper discusses the grey accumulation of original data and the grey derivative's white value, and proposes an unbiased direct grey model.

本文在深入讨论了灰色系统背景值以及灰色序列生成等问题，提出了无偏直接灰色模型。

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The model has the advantages of direct grey model and unbiased grey model; it can express the changing characteristics of raw sequence, and is unbiased.

该模型同时具备直接灰色模型和无偏灰色模型的优点，能够直接描述原始数列的变化特性并且没有偏差。

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If data have accurate index law, direct data grey model should build to do with them.

如果数据本身具有准指数规律，应该按照直接数据灰色模型的建模方法。

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But Wiedemann, who founded the direct marketing unit of Grey Global Group (nasdaq: GREY - news - people ) and until a few months ago was running Responsys, a Silicon Valley online marketing firm, does the bidding of one of America's most implacable bosses: Chicago billionaire Samuel Zell .

FORBES: No Free Lunch

Although Grey Goose found no direct evidence to suggest direct involvement by the Russian government, "We did find evidence of links to some existing organized criminal elements in Russia, " says Ferguson.

FORBES: Magazine Article

They also revealed the roof of the grey van had been cut away to direct the device.

BBC: Two released in dissident operation