在ggplot2中的分组条形图上添加趋势线

install.packages("ggplot2")
library(ggplot2)

ggplot(data = df, aes(x = group, y = count, fill = group)) +
  geom_bar(stat = "identity", position = "dodge")

ggplot(data = df, aes(x = group, y = count, fill = group)) +
  geom_bar(stat = "identity", position = "dodge") +
  geom_smooth(method = "lm", se = FALSE)

ggplot(data = df, aes(x = group, y = count, fill = group)) +
  geom_bar(stat = "identity", position = "dodge") +
  geom_smooth(method = "lm", se = FALSE) +
  labs(title = "Grouped Bar Chart with Trendline",
       x = "Group", y = "Count") +
  scale_fill_manual(values = c("#FF0000", "#00FF00", "#0000FF"))