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rggplot2scatter-plotaxis-labels

How can I change the name of the tick marks in a scatterplot with ggplot in R?

In my scatterplot, I would like to replace the names of the tick marks (1 to 8) with the corresponding CEFR levels (A1.1 to B2.2) without changing the data frame.

1 = A1.1,
2 = A1.2,
3 = A2.1,
4 = A2.2,
5 = B1.1,
6 = B1.2,
7 = B2.1,
8 = B2.2

My code: 

ggplot(data =  doppelratings1_mit_ID,
  aes(x = R1 , y = R2)) +
  geom_jitter(shape=1, width = 0.05, height = 0.15) + 
  geom_smooth() +
  xlab("Rater 1") +
  ylab("Rater 2") +
  ggtitle("Korrelation zwischen Rater 1 und 2", paste("n = 19 Texte ")) +
  theme_bw(12)+
  geom_abline(intercept = 0, slope = 1)

I tried

CEFR <- c("A1.2", "A2.2", "B1.2")

And then

+ scale_x_discrete(labels= CEFR)

but then the tick marks disappeared.

Thanks for your help!

See my scatter plot:

Correlation between two Raters

Solution

  • Add this to your plot definition:

    tick_names <- c('A1.1', 'A1.2', ..., 'B2.2')

ggplot() + 
  ... +
scale_x_continuous(breaks = 1:8, labels = tick_names, limits = c(1, 8)) +
scale_y_continuous(breaks = 1:8, labels = tick_names, limits = c(1, 8))