模型一：不含 截距项 （ intercept term ）及 时间趋势项 （ time trend ），即为一纯随机漫步模型。
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Suffice it to say, neither of the alternatives proposed by the Senators will offer near-term capabilities to intercept Iraqi intermediate-range ballistic missiles or similar threats from other sources.
CENTERFORSECURITYPOLICY: Center for Security Policy | ��Do The Right Thing��: Congressional Defense Choices For The Post-Kuwait World
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