Stacked bar chart in R : <p>I have a data set that looks like this</p>

<p><a href="https://i.stack.imgur.com/R7GOp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/R7GOp.png" alt="enter image description here"></a></p>

<p>I want to plot a stacked bar chart with X being Session and Y as Absent and Present stacked one above another. How to do this in <code>ggplot()</code> in <code>R</code></p>
