title: R - loess prediction returns NA
body: <p>I am struggling with &quot;out-of-sample&quot; prediction using <code>loess</code>. I get <code>NA</code> values for new x that are outside the original sample. Can I get these predictions?</p>
  <pre><code>x &lt;- c(24,36,48,60,84,120,180)
  y &lt;- c(3.94,4.03,4.29,4.30,4.63,4.86,5.02)
  lo &lt;- loess(y~x)
  x.all &lt;- seq(3, 200, 3)
  predict(object = lo, newdata = x.all)
  </code></pre>
  <p>I need to model full yield curve, i.e. interest rates for different maturities.</p>