Change size of a line plot, understand how the size argument works

Question

I\'m making a multiple lines plot with errorbars. If I don\'t use the size argument, everything is fine:

# sample data
Response=runif(4)
ResponseMin         


        

Answer 1

If you set size inside aes you are mapping it to a variable

`1` = 1

and ggplot2 creates a legend. If you just want to set the size, you can do that outside of aes:

geom_line(aes(group=Case), size = 1)