Oct 7, 2017
#pnorm #rnorm #dnorm #qnorm #mean #variance #normaldistribution
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#pnorm #rnorm #dnorm #qnorm #mean #variance #normaldistribution
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dnorm,pnorm,qnorm,rnorm
d Density的缩写，表示密度函数。举个例子，标准正态分布x=0对应的值可以用dnorm(0)计算
p Probability的缩写，表示概率函数。举个例子，标准正态分布从负无穷大到0的概率，可以用pnorm(0)计算
q Quantile的缩写，表示分位函数。举个例子，如果知道标准正态分布从负无穷大到x的概率是0.9678，想要知道这个x的值，可以通过qnorm(0.9678)计算。
r Random的缩写，表示随机函数。用于随机生成符合正态分布的数值，举个例子，如果想随机生成10个符合标准正态分布的函数，可以用rnorm(10)来获得。