简单区分 standard error 与 standard deviation #194
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建议将 standard_error 翻译为 “标准误差”，以区别 standard_deviation 况且，书里其他地方的 error 都翻译成了 “误差”
严格的讲，standard error (se) 与 standard deviation (sd) 是两个概念。The standard error is ... an estimate of that standard deviation (摘自 wikipedia). 可以简单理解为，sd是理论值，se是计算值，在实际计算中，se会无限逼近sd。
This reverts commit 68f1d72.
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严格的讲，standard error (se) 与 standard deviation (sd) 是两个概念。The standard error is ... an estimate of that standard deviation (摘自 wikipedia). 可以简单理解为，sd是理论值，se是计算值，在实际计算中，se会无限逼近sd。