Error: no stat called StatHline

Question

I have a data frame as follows:

variable=c(\"D\",\"D\",\"C\",\"C\",\"C\",\"A\",\"B\",\"B\",\"B\",\"B\")
value=c(80,100,70,68,65,45,33,31,36,32)
Count=as.integer(         


        

Answer 1

stat_hline got removed in ggplot2 2.0.0, but never fear; it wasn't really necessary anyway. If you remove the stat argument entirely, it will default to identity, which is fine. (summary can work, too, if you prefer.) You need to change the aes mapping, though, changing yintercept to y to account for the new stat.

All together,

ggplot(sumVarVal, aes(variable, value)) +
  geom_point(aes(size = Count), pch=15) + 
  guides(fill=guide_legend(title="New")) + 
  theme(legend.background = element_rect(fill="gray90", size=.5, colour = "black"), 
        legend.text=element_text(size=rel(1.3)), 
        legend.title=element_text(size=rel(1.3), face="plain"), 
        legend.position="bottom", 
        axis.text = element_text(size=rel(1.3)),
        axis.title = element_text(size = rel(1.3))) + 
  labs(x="Learning Outcome", y = "Percentage Grade") + 
  geom_errorbar(width=0.6, colour = "blue", size = 1, aes(ymax=..y.., ymin=..y.., y = mean))

produces