height of president divided by height of most successful opponent. Data from Stulp et al. 2013's paper.

President's_height.R

height_ratio <- c(0.924324324, 1.081871345, 1, 0.971098266, 1.029761905,
                  0.935135135, 0.994252874, 0.908163265, 1.045714286, 1.18404908,
                  1.115606936, 0.971910112, 0.97752809, 0.978609626, 1,
                  0.933333333, 1.071428571, 0.944444444, 0.944444444, 1.017142857,
                  1.011111111, 1.011235955, 1.011235955, 1.089285714, 0.988888889,
                  1.011111111, 1.032967033, 1.044444444, 1, 1.086705202,
                  1.011560694, 1.005617978, 1.005617978, 1.005494505, 1.072222222,
                  1.011111111, 0.983783784, 0.967213115, 1.04519774, 1.027777778,
                  1.086705202, 1, 1.005347594, 0.983783784, 0.943005181, 1.057142857)

vote_support <- c(0.427780852, 0.56148981, 0.597141922, 0.581254292, 0.530344067,
              0.507425996, 0.526679292, 0.536690951, 0.577825976, 0.573225387,
              0.550410082, 0.559380032, 0.484823958, 0.500466176, 0.502934212,
              0.49569636, 0.516904414, 0.522050547, 0.531494442, 0.60014892, 
              0.545079801, 0.604274986, 0.51635906, 0.63850958, 0.652184407, 
              0.587920412, 0.5914898, 0.624614752, 0.550040193, 0.537771958, 
              0.523673642, 0.554517134, 0.577511576, 0.500856251, 0.613444534, 
              0.504063153, 0.617883695, 0.51049949, 0.553073235, 0.59166415, 
              0.538982024, 0.53455133, 0.547304058, 0.497350649, 0.512424242, 
              0.536914796)

# Make a data.frame 
Presidents = data.frame(cbind(height_ratio, vote_support))

# Make the plot
heightPlot <- function() {
library(ggplot2)
library(SciencesPo)
fit=lm(vote_support~height_ratio,data=Presidents)
mylabel=lm2eqn("Presidents","height_ratio","vote_support")
ggplot(Presidents, aes(y=vote_support, x=height_ratio)) + 
  geom_smooth(method=lm, colour="red", fill="gold")+
  geom_point(size=5, alpha=.7) +
  annotate(geom='text',x=1.1,y=.67,size=7,label=mylabel,family='Times',fontface='italic')+
  xlim(.9,1.2) + ylim(.40, .70)+
  xlab("Presidential Height Ratio") + 
  ylab("Relative Support for President") +
  theme_pub()
  }
  
heightPlot()  

The mentioned function is indeed part of the package SciencesPo, but only available if installed from GitHub repo.