But the methods of estimation of parameter of the GARCH models, BHHH and GMM, may become invalid because they usually meet the situation that the middle data fluctuate greatly.

而GARCH模型参数估计的主要方法BHHH算法和广义矩方法在实际运算中常遇到中间数据震荡从而导致算法整体失效等。

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Data processing time does fluctuate.

数据处理花的时间是波动的。

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The program would be capped at 200, 000 a year, but the number of visas would fluctuate, depending on unemployment rates, job openings, employer demand and data collected by a new federal bureau pushed by the labor movement as an objective monitor of the market.

WSJ: Business, labor close on deal for immigration bill