我想知道为什么变量mean_y不被我识别geom_hline(yintercept = unique(mean_y)) call?
library(tidyverse)
set.seed(20)
n_groups <- 2
n_in_group <- 20
sd_e = 2
groups <- gl(n_groups, n_in_group, labels = c("T","C"))
age <-rnorm(length(groups), 25, 3)
betas <- c(5,0,0,2)
dat <- data.frame(groups=groups,age=age)
X <- model.matrix(~ groups * age, data = dat)
lin_pred <- as.vector(X %*% betas)
dat$y <- rnorm(nrow(X), lin_pred, sd_e)
dat %>% group_by(groups) %>% mutate(mean_y = mean(y)) %>%
ungroup() %>%
ggplot()+aes(x = age, y = y) +
geom_point(aes(color=groups)) +
geom_hline(yintercept = unique(mean_y)) # Error in unique(mean_y) :
# object 'mean_y' not found
变量需要在里面aes(), try:
geom_hline(aes(yintercept = mean_y))
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