title: Error message: Error in data.frame(..., check.names = FALSE) : arguments imply differing number of rows: 250, 259
body: <p>I got this problem when I try to export some data: </p>
  
  <pre><code>write.csv(avvik &lt;- cbind(u.s, j.k, k.e), "avvik.txt")
  </code></pre>
  
  <p>I've already understood that the problem probably lies in "your trying to set the sample size from some groups equal to zero". This is what I did learn from another post here at the forum. But I'm quite new at using R, so what does this mean?</p>