Boxplot (ggplot2) not working as expected

Question

I'm trying to plot a simple boxplot where I get 15 boxplots for respondents age of 15 "Cadernos" (15 surveys, surveys A, B, C .. to O). But that's not working as expected. I have already tried to switch places to the "Cadernos" (surveys) and "Idade" (age) variables. Any idea? What I expected was 15 boxplots in the vertical axis.

The code I'm using is the follow:

library(ggplot2)

select_base %>% 
  ggplot(aes(Idade,Caderno)) +
  geom_boxplot()

the plot I get is the following:

I don't think that code generated the plot: the x and y variables are reversed in the code versus the plot. — neilfws
– neilfws, Commented Dec 7, 2021 at 2:17
Also it looks like Idade is a variable of type character or factor, instead of numeric. What does str(select_base) show you? — neilfws
– neilfws, Commented Dec 7, 2021 at 2:22
@neilfws You're right, the code that generrates that plot has those variables switched, I slipped-up. About the type of varible, str(select_base) returns: 'data.frame': 2876 obs. of 2 variables: $ Caderno: chr "N" "N" "M" "M" ... $ Idade : chr "15" "15" "15" "15" ... So, yes, they're characters, would that be affecting the code? Tks in advance — dadaset
– dadaset, Commented Dec 7, 2021 at 3:05
Yes, you need the y-variable to be of type numeric. You may be able to convert the column using as.numeric(), but it's better to figure out why R read it in as a character in the first place - for example, does the data file contain something other than numbers in that column. — neilfws
– neilfws, Commented Dec 7, 2021 at 3:19

Kra.P · Accepted Answer · 2021-12-07 02:16:10Z

1

I'm not sure that you did not provide your data, but you may try

select_base %>% 
  ggplot(aes(x = Caderno, y = Idade, group = Caderno)) +
  geom_boxplot()

For example using data dummy it will be like plot below

dummy <- data.frame(
  x = rnorm(50),
  y = rep(c("a","b","c","d","e"),10)
)
dummy %>%
  ggplot(aes(x = y,y = x,  group = y)) +
  geom_boxplot()

answered Dec 7, 2021 at 2:16

Kra.P

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