title: Reshape from wide-format to long-format for ANOVA
body: <p>After I use <code>na.omit(pruefung)</code> on my dataset, I now want to get it into a long-format. Can anyone please help me as I'm new to R? Which command do I have to use?</p>
  
  <p>Heres the data set: <a href="http://www.file-upload.net/download-8313566/pruefung.csv.html" rel="nofollow">http://www.file-upload.net/download-8313566/pruefung.csv.html</a></p>