I am using some longitudinal data to make a line plot with ggplot2. The goal is to plot the data for each individual (Name) across time (Age). However, I don’t know why there are vertical lines shown in the plot:

ggplot(sum_data, aes(x=Age,y=Turns,group=Name))+
  geom_line()

How do I remove those vertical lines? Thanks for any help!

Here is the data:

dput(sum_data)
structure(list(Age = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
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443L, 181L, 145L, 307L, 304L, 353L, 328L, 185L, 105L, 218L, 560L, 
430L, 324L, 779L, 319L, 377L, 159L)), class = c("grouped_df", 
"tbl_df", "tbl", "data.frame"), row.names = c(NA, -686L), groups = structure(list(
    Age = c(1, 1, 2, 2, 3, 3, 5, 5, 7, 7), Speaker = c("CHI", 
    "MOT", "CHI", "MOT", "CHI", "MOT", "CHI", "MOT", "CHI", "MOT"
    ), .rows = structure(list(1:83, 84:166, 167:235, 236:304, 
        305:371, 372:438, 439:506, 507:574, 575:630, 631:686), ptype = integer(0), class = c("vctrs_list_of", 
    "vctrs_vctr", "list"))), class = c("tbl_df", "tbl", "data.frame"
), row.names = c(NA, -10L), .drop = TRUE)) 


  [1]: https://i.stack.imgur.com/i6t1A.png

>Solution :

As your data contains multiple Speakers you end up with multiple obs. per name. Hence, to get rid of the vertical lines you have to take the Speakers into account by e.g. grouping by the interaction of Speaker and name:

library(ggplot2)

ggplot(sum_data, aes(
  x = Age, y = Turns,
  group = paste(Name, Speaker, sep = "."), color = Speaker
)) +
  geom_line()