ggplot2 position_dodge height does not work

Question

I have the following data:

simres_auc2 <- structure(list(MINDGDP = c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 
3L, 3L, 3L, 3L, 3L, 3L, 3L), PSIZE = c(5L, 5L, 5L, 5L, 10L, 10L, 
10L, 10L, 20L, 20L, 20L, 20L, 50L, 50L, 50L, 50L, 5L, 5L, 5L, 
5L, 10L, 10L, 10L, 10L, 20L, 20L, 20L, 20L, 50L, 50L, 50L, 50L, 
5L, 5L, 5L, 5L, 10L, 10L, 10L, 10L, 20L, 20L, 20L, 20L, 50L, 
50L, 50L, 50L), simno = c(13L, 13L, 13L, 13L, 16L, 16L, 16L, 
16L, 19L, 19L, 19L, 19L, 22L, 22L, 22L, 22L, 13L, 13L, 13L, 13L, 
16L, 16L, 16L, 16L, 19L, 19L, 19L, 19L, 22L, 22L, 22L, 22L, 13L, 
13L, 13L, 13L, 16L, 16L, 16L, 16L, 19L, 19L, 19L, 19L, 22L, 22L, 
22L, 22L), METHOD_RED = c("EVA (alpha = 0.001)", "EVA (alpha = 0.005)", 
"EVA (alpha = 0.01)", "EVA (alpha = 0.05)", "EVA (alpha = 0.001)", 
"EVA (alpha = 0.005)", "EVA (alpha = 0.01)", "EVA (alpha = 0.05)", 
"EVA (alpha = 0.001)", "EVA (alpha = 0.005)", "EVA (alpha = 0.01)", 
"EVA (alpha = 0.05)", "EVA (alpha = 0.001)", "EVA (alpha = 0.005)", 
"EVA (alpha = 0.01)", "EVA (alpha = 0.05)", "EVA (alpha = 0.001)", 
"EVA (alpha = 0.005)", "EVA (alpha = 0.01)", "EVA (alpha = 0.05)", 
"EVA (alpha = 0.001)", "EVA (alpha = 0.005)", "EVA (alpha = 0.01)", 
"EVA (alpha = 0.05)", "EVA (alpha = 0.001)", "EVA (alpha = 0.005)", 
"EVA (alpha = 0.01)", "EVA (alpha = 0.05)", "EVA (alpha = 0.001)", 
"EVA (alpha = 0.005)", "EVA (alpha = 0.01)", "EVA (alpha = 0.05)", 
"EVA (alpha = 0.001)", "EVA (alpha = 0.005)", "EVA (alpha = 0.01)", 
"EVA (alpha = 0.05)", "EVA (alpha = 0.001)", "EVA (alpha = 0.005)", 
"EVA (alpha = 0.01)", "EVA (alpha = 0.05)", "EVA (alpha = 0.001)", 
"EVA (alpha = 0.005)", "EVA (alpha = 0.01)", "EVA (alpha = 0.05)", 
"EVA (alpha = 0.001)", "EVA (alpha = 0.005)", "EVA (alpha = 0.01)", 
"EVA (alpha = 0.05)"), auc = c(0.5, 0.440423333333333, 0.73412, 
0.570526, 0.5, 0.465404, 0.695695333333333, 0.536143333333333, 
0.5, 0.482674, 0.673217333333333, 0.517231333333333, 0.5, 0.478126666666667, 
0.661129333333333, 0.530846, 0.5, 0.4520975, 0.742583, 0.577082, 
0.5, 0.4546035, 0.694907, 0.550087, 0.5, 0.4706495, 0.6585825, 
0.544709, 0.5, 0.473219, 0.659395, 0.546985, 0.5, 0.45364, 0.754459333333333, 
0.58385, 0.5, 0.442713333333333, 0.699316, 0.563635333333333, 
0.5, 0.486780666666667, 0.678044666666667, 0.554051333333333, 
0.5, 0.462297333333333, 0.651185333333333, 0.544234666666667)), class = c("tbl_df", 
"tbl", "data.frame"), row.names = c(NA, -48L), .Names = c("MINDGDP", 
"PSIZE", "simno", "METHOD_RED", "auc"))

The following code generates the following plot, where position_dodge is working correctly.

ggplot2::ggplot(data = simres_auc2,
                          aes_string(x = "factor(METHOD_RED)",
                                     y = "auc")) + 
ggplot2::geom_point(aes_string(shape = "factor(MINDGDP)",
                               group = "factor(MINDGDP)",
                               colour = paste0("factor(PSIZE)")),
                    position = position_dodge(width = 0.25))

However, I want factor(METHOD_RED) on the y-axis, and auc on the x-axis. Consequently, in the following code, I have interchanged x and y , and replaced width in position_dodge with height .

ggplot2::ggplot(data = simres_auc2,
                        aes_string(y = "factor(METHOD_RED)",
                                   x = "auc")) + 
  ggplot2::geom_point(aes_string(shape = "factor(MINDGDP)",
                             group = "factor(MINDGDP)",
                             colour = paste0("factor(PSIZE)")),
                  position = position_dodge(height = 0.25))

However, this code gives the following plot, in which position_dodge is not working as I had hoped.

Does anyone know why this is the case, and how I can circumvent the issue? Please note that using coord_flip is not an option for me, as it adversely affects faceting that I want to use in the code. See, for example, this question and this Github issue .

Answer 1

A possible solution to your problem might be using position_jitter and using a width of 0 and a height of 0.25 :

ggplot(data = simres_auc2, aes(y = factor(METHOD_RED), x = auc)) + 
  geom_point(aes(shape = factor(MINDGDP), group = factor(MINDGDP), colour = factor(PSIZE)),
             position = position_jitter(width = 0, height = 0.25))

which gives:

Answer 2

You can use continuous y scale and manually map y positions to different groups of data.

RANGE <- .5

ggplot(data = simres_auc2, aes(y = as.integer(factor(METHOD_RED)), x = auc)) + 
  geom_point(aes(y = as.integer(factor(METHOD_RED)) + 
                   RANGE *(-.5+(as.integer(factor(MINDGDP))-1)/(length(unique(MINDGDP))-1)), 
                 shape = factor(MINDGDP), group = factor(MINDGDP), 
                 colour = factor(PSIZE, levels = sort(unique(PSIZE))) ), size = 4 ) +
  scale_y_continuous(labels = function(x) levels(factor(simres_auc2$METHOD_RED))[x]) +
  guides(color = guide_legend(title = "PSIZE"), shape = guide_legend(title = "MINDGDP"))

Answer 3

I've been having the same issue and this is the first question that pops up on google, so I thought I'd post my answer in case someone else is having the same problem:

The package ggstance provides vertical versions for several of the position-functions, in this case position_dodgev()

library(ggstance)

ggplot2::ggplot(data = simres_auc2,
                aes_string(y = "factor(METHOD_RED)",
                           x = "auc")) +
  ggplot2::geom_point(
    aes_string(
      shape = "factor(MINDGDP)",
      group = "factor(MINDGDP)",
      colour = paste0("factor(PSIZE)")
    ),
    position = position_dodgev(height = 0.25)
  )