title: R markdown ! Extra alignment tab has been changed to \cr. error occured
body: <p>In R markdown I want to make the table with 2 rows and 8 columns.</p>
  
  <pre><code>\begin{table}[ht]
  \begin{tabular}{c|c|c|c|c|c|c|c}
  \hline
  variable &amp; N &amp; Mean &amp; Std.Dev &amp; SE Mean &amp; 95% cI &amp; T &amp; P \\
  Y &amp; 25 &amp; 92.5805 &amp; ? &amp; 0.4673 &amp; (91.6160, ?) &amp; ? &amp; 0.002 \\
  \hline
  \end{tabular}
  \end{table}
  </code></pre>
  
  <p>I entered this command and it returns this error message.</p>
  
  <pre><code>! Extra alignment tab has been changed to \cr.
  &lt;recently read&gt; \endtemplate 
  
  l.101 Y &amp; 25 &amp; 92.5805 &amp;
  
  pandoc.exe: Error producing PDF
  error: pandoc document conversion failed with error 43
  </code></pre>
  
  <p>I guess I entered tabular right and nothing to be calculated.</p>
  
  <p>They' are just texts and numbers. </p>
  
  <p>I tried to search similar questions and compare the examples codes.</p>
  
  <p>But I don't know how to solve it.</p>