January 08, 2015
Wajdi Ben Saad
I was asked by new students in the Statistics and Data Analysis School of Tunis (and by others friends) about ways to plot densities and the best software to do that.
I will try to give some examples with R software on how to plot density .
If you don't know what R is, you can take a look at my old article that explains that very well with some good R learning resources . (
here in French ).
You know that densities are all about random data and the first thing that comes in mind is histograms.
To start this task, we will first set the data sample that we will work with which should be random, and then we will start plotting some nice graphics with the
ggplot2 library.
Basic things :Histogram and density plots:
 |
| regular histogram |
 |
| where is the mean! |
 |
| density plot |
 |
| Overlay of density and histogram |
Histograms and densities with multiple groups:
 |
| Overlaid histograms |
 |
| Interleaved histograms |
 |
| Density plots |
 |
| Density plots with semi-transparent fill |
 |
| Density plots with means |
 |
| Overlaid histograms with means |
Box-plots:
 |
| Basic Box-plot |
 |
| A basic box with the conditions colored |
 |
| legend removed |
 |
| With flipped axes |
So I hope this post would help you with plotting densities and histograms !
It can be fun!
