title: class attribute is not nominal! Weka
body: <p>I have downloaded a dataset from the uci archive called mammographic mass data. I have saved the file into edexcel and then saved as a .csv file. The attribute information for the data set is:</p>
  
  <p>Attribute Information:</p>
  
  <ol>
  <li><p>BI-RADS assessment: 1 to 5 (ordinal)  </p></li>
  <li><p>Age: patient's age in years (integer)</p></li>
  <li><p>Shape: mass shape: round=1 oval=2 lobular=3 irregular=4 (nominal)</p></li>
  <li>Margin: mass margin: circumscribed=1 microlobulated=2 obscured=3 ill-  defined=4 spiculated=5 (nominal)</li>
  <li>Density: mass density high=1 iso=2 low=3 fat-containing=4 (ordinal)</li>
  <li>Severity: benign=0 or malignant=1 (binominal)</li>
  </ol>
  
  <p>I open the file in the experiment environment and try to run however I get the following error message:</p>
  
  <p>13:01:56: Started</p>
  
  <p>13:01:56: Class attribute is not nominal!</p>
  
  <p>13:01:56: Interrupted</p>
  
  <p>13:01:56: There was 1 error</p>
  
  <p>I have tried changing the attribute to class in the explorer but that has not worked. Any suggestions would be great :)</p>