这是我的数据。
我试图找出A
组和B
组中的library(ggplot2)
n <- 10000
df <- data.frame(
cats=rep(c("A","B"), each=n),
vals=c(rnorm(n, mean=10, sd=2), rnorm(n, mean=20, sd=2))
)
ggplot(df, aes(vals, color=cats)) +
geom_density()
,但我很茫然:
beam.io.ReadFromText(somefile.json
答案 0 :(得分:1)
您可以使用dplyr :: summarize
library(dplyr)
df %>% group_by(cats) %>% summarize(sd = sd(vals), mean = mean(vals))
cats sd mean
<fct> <dbl> <dbl>
1 A 1.99 10.0
2 B 1.98 20.0