title: How to change font size on stat_poly_eq in ggplot2 R
body: <p>I have a ggplot stored in say <code>p</code> and wish to add a <code>poly_stat_eq</code> layer to display the equation of the curve. I want to change to font size of the text but I'm unable to find a documentation on how to achieve it</p>
  
  <pre><code>p + 
    stat_poly_eq(formula = y ~ x, 
                 aes(label = paste(..eq.label.., ..rr.label.., sep = "~~~")),
                 label.x = 4, label.y = -5, parse = TRUE) 
  </code></pre>