Histograms and Density Plots in ggplot2
Now you will learn the ggplot2 syntax for building and customizing histograms.
Add mean line and density plot on the histogram
- The histogram is plotted with density instead of count on y-axis
- Overlay with transparent density plot. The value of alpha controls the level of transparency
# Add mean line p+ geom_vline(aes(xintercept=mean(weight)), color="blue", linetype="dashed", size=1) # Histogram with density plot ggplot(df, aes(x=weight)) + geom_histogram(aes(y=..density..), colour="black", fill="white")+ geom_density(alpha=.2, fill="#FF6666")