title: GRAPH with ggplot
body: <p>I have this dataframe :</p>
  <pre><code>year = c(rep(1998,4),rep(2000,5),rep(2002,2),rep(2004,2))
  gift = c(0,0,0,0,1,0,1,1,0,0,0,1,0)
  type = c(&quot;L&quot;,&quot;L&quot;,&quot;L&quot;,&quot;H&quot;,&quot;H&quot;,&quot;L&quot;,&quot;L&quot;,&quot;L&quot;,&quot;L&quot;,&quot;L&quot;,&quot;H&quot;,&quot;L&quot;,&quot;L&quot;)
  data = as.data.frame(cbind(anno,gift,type))
  </code></pre>
  <p>I have to create a graph with <code>ggplot</code> ,with x = year , y = probability of gift=1 and two type of points, one for type = L and one for type = H. So for each year I need two points, one that shows probability of gift = 1 for L and one that shows probability of gift=1 for H
  Thanks a lot.</p>