title: Fastest way to detect if vector has at least 1 NA?
body: <p>What is the fastest way to detect if a vector has at least 1 <code>NA</code> in R?  I've been using:</p>
  
  <pre><code>sum( is.na( data ) ) &gt; 0
  </code></pre>
  
  <p>But that requires examining each element, coercion, and the sum function.</p>