The hydrologic design values of specific design return period or frequency are random variables having certain distribution pattern, so there are some uncertainty in it.
指定设计重现期或频率的水文设计值为随机变数，有一定的分布规律，表明它有相应的不确定性。
Based on the clump intensity index, regressive analysis method and zero frequency method, the spatial distribution pattern of Latori bicolor (Walker) larvae was studied.
应用聚集度指标法、回归分析法、零频率方法对两色绿刺蛾幼虫在毛竹林间的分布型进行测定。
It was proved that the established index model could be used to well-explain the distribution pattern of sandstorm frequency in the study region.
建立的气候影响指数模型，能够用来解释当前浑善达克沙地沙尘暴频率的分布格局。
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