定义一个显著性水平表( table of significance levels)：这是真正的发生频率(occurrence frequency)出现在计算的区间之外的概率：
基于16个网页-相关网页
word occurrence frequency statistics 词频统计
Paragraph Co-occurrence Frequency 段落同现频率
food occurrence frequency 食物出现率
landslide occurrence frequency 滑坡频率
frequency of occurrence [统计] 出现次数 ; 出现频次 ; [统计] 出现频率 ; 发生频率
co occurrence frequency matrix 同现频率矩阵
Each modal orientation is attached to certain modal expressions. By counting the occurrence frequency of the expressions, the proportion of each orientation can be calculated; furthermore, orientations of English and Chinese news reporting can be detected and compared.
每种情态取向都有其固定的情态表达方式，通过对各种情态表达方式在语篇中所占比例的统计，可计算出每种情态取向在语篇中的出现频率，进而比较英汉新闻语篇在情态上的取向。
参考来源 - 英汉情态取向在新闻语篇中的对比分析On occurrence frequency, there were 0.865 small seeds and 1.359 infertile seeds per fruit on average, i. e. , 3.5% for small seed and 5.6% for infertile seeds, the total ocurrence frequency being 9.1%.2.
饱满小种出现频率为3.5％，瘪粒小种子出现频率为5.6％，总的小种子出现频率为9.1％。
参考来源 - 尤力克柠檬（Citrus limon （L.）Burm.F.）小种子植株遗传多样性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
With the increase of the vehicle amount, traffic accident occurrence frequency in China has risen.
随着汽车总量的增长，我国已成为交通事故发生频率最高的国家之一。
A frequent item of a data stream is a data point whose occurrence frequency is above a given threshold.
数据流频繁项是指在数据流中出现频率超出指定阈值的数据项。
In different duration, the annual changes of occurrence frequency of heavy fog in Hefei area were different.
在不同持续时间内，合肥地区大雾出现频数的年变化不同。
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