问题描述
我已经阅读了关于 qnorm() 的文档，但无法真正理解它的作用.能不能详细回答一下qnorm()是做什么的?
I have read the documentation on qnorm() but could not really understand what it does. Can you please answer in detail what qnorm() does?
注意-请原谅我问这么简单的问题.我是 R 的初学者.
note-Please excuse me for asking such a simple question. I am a beginner at R.
推荐答案
qnorm() 函数旨在找到边界值，P(X 中的 A代码>，给定概率 P.
The function qnorm() aims to find the boundary value, A in P(X < A), given the probability P.
例如，假设您要查找均值为 70 且标准差为 3 的正态分布的第 85 个百分位数.然后您要求:
For example, suppose you want to find the 85th percentile of a normal distribution whose mean is 70 and whose standard deviation is 3. Then you ask for:
qnorm(0.85,mean=70,sd=3)
[1] 73.1093
来自 https://cran.r-project.org/web/packages/tigerstats/vignettes/qnorm.html
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