title: Perform a Shapiro-Wilk Normality Test
body: <p>I want to perform a Shapiro-Wilk Normality Test test. My data is <code>csv</code> format. It looks like this:</p>
  
  <pre><code> heisenberg
      HWWIchg
  1    -15.60
  2    -21.60
  3    -19.50
  4    -19.10
  5    -20.90
  6    -20.70
  7    -19.30
  8    -18.30
  9    -15.10
  </code></pre>
  
  <p>However, when I perform the test, I get:</p>
  
  <pre><code> shapiro.test(heisenberg)
  </code></pre>
  
  <blockquote>
    <p>Error in <code>[.data.frame</code>(x, complete.cases(x)) : 
      undefined columns selected</p>
  </blockquote>
  
  <p>Why isnt`t R selecting the right column and how do I do that? </p>