rggplot2jitter

Move jittered points to align with dodged boxplots but the points have different shapes


Tons of answers for dodging points and boxplots at the same time but what if I want different shaped points by a 3rd factor?

    data<-cbind(expand.grid(trt=factor(1:4), block=factor(1:2), year=factor(c(2013, 2022))), value=runif(512))

I have:

      ggplot(data, aes(x = trt, y = value, color = year)) +
      geom_boxplot(outlier.size = 0,size=3,alpha=0.7) +
      geom_point(alpha=0.4, position = position_jitterdodge(dodge.width = 1),
                 size=3,aes(shape=factor(block)))

And

      geom_boxplot(position = position_dodge2(0.85, preserve = "single"), outlier.size=0, size=3,alpha=0.7) + 
        geom_jitter(position = position_dodge2(0.85,preserve = "single"),aes(shape=factor(block)),size=3,alpha=0.4)

Both of which produce roughly the same thing: Note the points aren't over their respective colored boxplots

How do I make this, but the points from each "year" are displayed dodged to the same side that their respective year is dodged in the boxplots? As it stands, ggplot is putting all of block 1 with 2013 every time instead of just those block 1 points that actually also are in year==2013.


Solution

  • You can use the group aesthetic

    ggplot(data, aes(x = trt, y = value, color = year)) +
        geom_boxplot(outlier.size = 0, alpha = 0.7, size = 2) +
        geom_point(alpha = 0.4, position = position_jitterdodge(jitter.width = 0.8),
                   size = 3, aes(shape = factor(block), group = year))
    

    enter image description here