Significance stars misaligned

[cperk]

I find that the significance stars do not line up well between each comparison. There are a lot of stars clumped together.

Here is some reproducible code using the mpg dataset. I want to show significance in the boxplot, named p, between 2seater and all the other cars:

p <- ggplot(mpg, aes(class, hwy)) p + geom_boxplot()+geom_signif(comparisons = list(c("2seater", "compact"), c("2seater", "midsize"), c("2seater", "minivan"), c("2seater", "pickup"), c("2seater", "subcompact"), c("2seater", "suv")), annotation="***", color="red",y_position = 40)

Unfortunately the signficance stars are not spread out properly:

It is also kind of hard to tell which pairs I am comparing. Do you have any suggestions to fix?

Thanks so much!!

[marcuslehr]

I have the same issue. There should be some vertical padding between the lines rather than overlaying them all at the same y_position. I was trying to do this manually, but going much above the graph causes the ggsignif annotations to disappear altogether.

A solution for this would be great.. seems like a fairly basic feature for the package.

[const-ae]

Sorry for the late reply (I know this is probably irrelevant for you now, but just for future reference).

There is a simple option available to automatically increase the distance between each line called step_increase.

library(ggplot2)
library(ggsignif)
ggplot(mpg, aes(class, hwy)) +
 geom_boxplot() + 
  geom_signif(comparisons = list(c("2seater", "compact"), c("2seater", "midsize"),
                                 c("2seater", "minivan"), c("2seater", "pickup"), 
                                 c("2seater", "subcompact"), c("2seater", "suv")), 
              annotation="***", color="red", step_increase = 0.1)

^{Created on 2019-02-20 by the reprex package (v0.2.1)}

[ACMGlueck]

Hi Constantin, As you noted here, step_increase in a great feature of your very nice package. However, I found that step_increase is not compatible with y_position. Here's an example based on your example above:

library(ggplot2) library(ggsignif) ggplot(mpg, aes(class, hwy)) + geom_boxplot() + geom_signif(comparisons = list(c("2seater", "compact"), c("2seater", "midsize"), c("2seater", "minivan"), c("2seater", "pickup"), c("2seater", "subcompact"), c("2seater", "suv")), annotation="***", color="red", y_position = 50, step_increase = 0.1)

The reason that I'd like to combine y_position with step_increase is that I am drawing several plots at once,using a consistent y axis. I'd therefore like to specify a consistent y_position too, to have the significance brackets positioned identically in all plots. Do you think that's possible? Without specifying the different y_position values "manually"? Best regards, Anton

[const-ae]

Hi ACMGlueck,

you are right that should be the expected behavior. I have implemented a fix (https://github.com/const-ae/ggsignif/commit/8e86adfec95828d6098f836ff5cd8969def032dd).

library(ggplot2)
library(ggsignif) 
ggplot(mpg, aes(class, hwy)) +
  geom_boxplot() + 
  geom_signif(comparisons = list(c("2seater", "compact"), 
                                 c("2seater", "midsize"), 
                                 c("2seater", "minivan"), 
                                 c("2seater", "pickup"), 
                                 c("2seater", "subcompact"), 
                                 c("2seater", "suv")), 
              annotation="***", color="red", 
              y_position = 50, step_increase = 0.1)

^{Created on 2019-11-08 by the reprex package (v0.3.0)}

I hope this addresses your issue. To use the fix, make sure that you install the latest development version from Github:

devtools::install_github("const-ae/ggsignif")

Best Regards, Constantin

[ACMGlueck]

Hi Constantin, Great - that's perfect! Problem resolved! And thanks for fixing this so quickly!!!