进一步完善了异常判别中的统计模型，并根据异常检测模型给出数据描述和相应异常判别算法，最后总结了异常判别算法的优点和将来的工作。

Perfect stat. model in the stat. model and give data description and arithmetic according to distinguishing model, summarize advantage of the arithmetic and work that be done in future.

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它使用有限的上下文统计建模技术，混合了多个顺序固定的上下文模型，预测输入序列中的下一个字符。

It USES a finite context statistical modeling technique that blends together several fixed-order context models to predict the next character in the input sequence.

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数据模型中的关键元素是一组统计信息，该统计信息收集了有关数据库中所包含的数据和系统目录表中所存储的数据的信息。

A key element in the data model is the set of statistics gathered about the data contained in the database and stored in the system catalog tables.

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