How to make geom_linerange dodge position according to geom_point

Question

I am trying to create a point plot with theoretical data that I generated in R. On the x-axis, I have four categories (1,2,3,4) and on the y-axis some predictions for each x-category. This is how I created the data:

x<-c(1,2,3,4,1,2,3,4)
conf.low<- c(0.65, 0.65, 0.15, 0.15, 0.65, 0.15, 0.65, 0.40)
predicted<-c(0.70, 0.70, 0.20, 0.20, 0.70, 0.20, 0.70,0.45)
conf.high<-c(0.75, 0.75, 0.25, 0.25, 0.75, 0.25, 0.75, 0.50)
group2<-   c("Day","Day","Day","Day","Night","Night","Night","Night")

tot.risk<-cbind.data.frame(x, predicted, conf.low, conf.high, group2) #Combine all the variables
tot.risk$group2<-as.factor(tot.risk$group2)
tot.risk$x<-factor(tot.risk$x, levels = c(1:4), labels = c("Double low", "Low hunt/high wolf", 
                                                           "High hunt/low wolf", "Double high"))
#Plot it
ggplot(tot.risk, aes(x = x, y = predicted)) +
  scale_fill_manual(values=c("white", "black"))+
  geom_point(pch=21, size=6, aes(fill=group2), position = position_dodge(width = 0.8))+
  scale_y_continuous(limits = c(0,0.8))+
  geom_linerange(aes(ymin=conf.low, ymax=conf.high), position = position_dodge(width = 0.8))+
  theme_classic()+
  theme(axis.ticks.y = element_blank(),
        axis.text.y = element_blank(),
        axis.text.x = element_text(size=12),
        axis.title.x = element_text(size=14),
        axis.title.y = element_text(size=14),
        legend.text = element_text(size=14),
        legend.title = element_blank())+
  xlab("Type of risk")+
  ylab("Probability of selection") ```` 

This is the plot I get when running this code: As you can see, the geom_linerange does not dodge together with the point. I have no idea how to fix this. Is there anyone that knows that the position_dodge does not work in this case?

Answer 1

You can use position_dodge2() to get the correct "dodging".

From the documentation:

position_dodge() requires the grouping variable to be be specified in the global or geom_* layer. Unlike position_dodge(), position_dodge2() works without a grouping variable in a layer.

Therefore you if you want to use position_dodge, put fill = group2 in ggplot(aes()) or directly use position_dodge2 in geom_linerange.

library(ggplot2)

ggplot(tot.risk, aes(x = x, y = predicted)) +
  scale_fill_manual(values=c("white", "black"))+
  geom_point(pch=21, size=6, aes(fill=group2), position = position_dodge(width = 0.8))+
  scale_y_continuous(limits = c(0,0.8))+
  geom_linerange(aes(ymin=conf.low, ymax=conf.high), position = position_dodge2(width = 0.8))+
  theme_classic()+
  theme(axis.ticks.y = element_blank(),
        axis.text.y = element_blank(),
        axis.text.x = element_text(size=12),
        axis.title.x = element_text(size=14),
        axis.title.y = element_text(size=14),
        legend.text = element_text(size=14),
        legend.title = element_blank())+
  xlab("Type of risk")+
  ylab("Probability of selection")