V2EX lower confidence bound

Lower Confidence Bound

定义 Definition

下置信界 / 置信区间下限:在统计学中,置信区间(confidence interval)的下端点;在给定置信水平(如 95%)下,用来表示某个参数(如均值、比例、效应量)可能取值范围的下界。在更一般的“区间估计/不确定性界”语境里,也可指对某个量的保守下界估计

发音 Pronunciation

/lo.r kn.f.dns band/

例句 Examples

The lower confidence bound is above zero, so the effect is likely positive.
下置信界高于零,因此该效应很可能为正。

Using a 95% confidence interval, the lower confidence bound for the conversion rate is 3.1%, which suggests performance won’t drop below that level under the model assumptions.
在 95% 置信区间下,转化率的下置信界为 3.1%,这表明在模型假设成立时,表现不太可能低于该水平。

词源 Etymology

confidence 来自拉丁语 confidere(“信任、确信”),在统计语境中指“置信/可信度”这一概率意义上的把握程度;bound 来自古法语 bounde/bod(“界限、边界”),表示范围的端点。组合起来即“置信范围的下边界”,常与 upper confidence bound(上置信界)成对出现,用于描述置信区间的两个端点。

相关词 Related Words

文献作品 Literary Works

  • All of Statistics: A Concise Course in Statistical Inference(Larry Wasserman)
  • Statistical Inference(George Casella & Roger L. Berger)
  • The Elements of Statistical Learning(Trevor Hastie, Robert Tibshirani, Jerome Friedman)
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