title: R - qqplot - Error msg: Error in rank(x, ties.method = "min", na.last = "keep") : unimplemented type 'list' in 'greater'
body: <p>I'm facing an error message when using "qqplot" of package "car".</p>
  
  <p>Code:</p>
  
  <pre><code>a = c(24,35,67,45,43,37,86,87,53,33,67,98)
  b = c(34,67,42,78,42,79,43,77,43,67,34,78)
  lm(a~b)
  qqplot(lm(a~b))
  </code></pre>
  
  <blockquote>
    <p>Error in rank(x, ties.method = "min", na.last = "keep") : 
      unimplemented type 'list' in 'greater'</p>
  </blockquote>
  
  <p>There is a similar question already, but with no helpful answer.</p>
  
  <p><a href="https://stackoverflow.com/q/38674646/10919966">R data analysis - qqplot - Error msg: unimplemented type &#39;list&#39; in &#39;greater&#39;</a></p>
  
  <p>Could someone help me?</p>