title: How do a perform a weighted, 2d kernel density estimation in R?
body: <p>I would like to produce a kernel density estimation in R, and am somewhat bamboozled by all the different packages.  I need to be able to:</p>
  
  <ol>
  <li>Specify weights</li>
  <li>Specify bandwidth size</li>
  <li>Specify bin size</li>
  </ol>
  
  <p>How would you go about this?   Bonus points for a code snippet.</p>