geom_line() 在使用分组数据的 ggplot 中不起作用

Question

I am trying to compare the average number of reviews an android app receives based on the month it was last updated. Here is my code / geom_point graph:

# Creating a group-means data set
gd <- appset %>% group_by(Month) %>% summarize(Reviews=mean(Reviews))

ggplot(appset, aes(Month, log(Reviews))) +
geom_point(data=gd) + scale_x_discrete(limits = month.abb)

Scatter Plot

My problem: I have been able to create a scatterplot, but I would like to connect the dots with geom_line() or geom_path(), but instead I keep getting the same scatterplot with vertical lines drawing up from the x-axis through each point. Here's my code and and image:

ggplot(appset, aes(Month, log(Reviews))) +
geom_point(data=gd) + geom_line() +
scale_x_discrete(limits = month.abb)

Attempted with geom_line()

Answer 1

For future reference:

ggplot(appset, aes(Month, log(Reviews))) +
geom_point(data=gd) + geom_line(data=gd) +
scale_x_discrete(limits = month.abb)

You need to add data=gd to the geom_line call, otherwise the data is inherited from the original ggplot call.