用户临界值策略保证用户能够并发地访问应用程序，并发量最高上限为提供商的用户授权规定的限制数。
User threshold policy ensures users can access concurrently the application up to the limit specified in a user license from the provider.
而时序模型适用性检验的核心问题是模型阶数确定。本文从F检验出发，以aic为基础，推导出模型定阶f检验临界值。
Based upon AIC rule, the critical value of F-test has been developed, the order of model simply determined by it.
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