R has two built-in functions that facilitate the plot building task when comparing a batch to a normal distribution: qqnorm and qqline . Note that the function ... ... <看更多>

Here's what QQ-plots look like (for particular choices of distribution) on ... R here. Those who are interested in running this app may just load these ... ... <看更多>

I don't think there's any need for plyr or calling qqnorm youself. YOu can just do ggplot(data = df1, aes(sample=vals)) + geom_qq() + ... ... <看更多>