title: Creating interaction effect plot, ggplot or other
body: <p>I have found an interaction effect between the predictors age and education level in a multiple regression model assessing the effects of various predictors on alcohol consumption. I wish to graph this interaction effect using ggplot, but an alternative will do.</p>
  
  <p>I have attempted to do it this way:</p>
  
  <pre><code>p &lt;- ggplot(DataFrame, aes(ED,AGE, label=interaction-effect))
  
  p &lt;- p + geom_point(colour= "red")+geom_text(size=3) # colour = colr does not work 
  
  p
  </code></pre>
  
  <p>This is continuously spouting errors. I cannot seem to find a way to simply make this plot and would greatly appreciate help.</p>