In the 21st century of the knowledge and economic time and facing with the fact of bursting data but poor knowledge, data mining has been put forward and applied in many fields of database management.
21世纪是知识经济的时代，面对数据爆炸而知识贫乏的现实，人们提出数据挖掘思想，并将其广泛应用到数据库管理的各个领域。
The disadvantage of establishing ARMA model with traditional time series analysis is analyzed; a new model building method based on judgment rules and long autoregression is put forward.
分析了传统时间序列分析法建立ARMA模型的不足，提出了一种利用模型阶数判断准则和长自回归法建模的新方法。
The way to determine the suitable time and space interval is put forward by investigating the variation of gas pressure gradient on wall with several time and space intervals.
通过考察选取不同时间步长和空间步长时煤壁瓦斯压力梯度的变化，提出了选取合适的时间步长和空间步长的方法。
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