Then, the paper presents the develop trend about the comprehensive estimation of fracture rock, study on dynamic model and numerical modelling, and combining the theory with practice.
在其基础上对节理岩体的质量综合评价、力学模型的研究、数值模拟的研究、理论与试验相结合等方面的发展趋势提出了几点看法。
Results there is multi-collinearity bias in the result of the least square estimation trend-surface model, use the method of ridge regression can control the multi-collinearity bias.
结果趋势面分析往往存在共线性偏倚，利用岭回归趋势面分析可以在一定程度上控制共线性偏倚。
Passive surveillance system, because of too high missing report rate, is not suitable to be used to estimate the incidence and only can be use for the estimation of epidemic trend.
被动监测系统漏报率过高，其监测数据需要通过漏报调查，才能计算校正发病率。
Passive surveillance system, because of too high missing report rate, is not suitable to be used to estimate the incidence and only can be use for the estimation of epidemic trend.
被动监测系统漏报率过高，其监测数据需要通过漏报调查，才能计算校正发病率。
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