有研究者用非参数方法评估步行间期及其2个亚期即摆动间期和支撑间期的概率密度函数（probability density functions），并以此计算步态节律标准差，结果提示PD患者步态变异性显著增加，该数据具有90.
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Based on the theory of random field, this paper derives the random area unit's distribution and probability density functions.
本文基于随机场理论，导出了随机面元的分布函数和概率密度函数。
The probability density functions of different rocks are introduced. And the distribution of tensional fracture area in the west of the Songliao Basin is predicted.
通过了各种岩性的张破裂概率隶属函数，预测松辽盆地酉部张裂缝区的分布。
If probability density functions of stress and strength are definite, stress strength interference model can be used to calculate reliability using formulation or numerical value integration.
应力、强度概率密度函数确定可采用应力-强度干涉模型，用公式或数值积分求可靠度。
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