title: Why weka associations apriori start button disabled even if the nominal values?
body: <p>I have three clinical data files in *.xls . I saved these three files in microsoft excel as *.csv file . and then I imported these *.csv files into the Weka tool . To use Apriori association rule, I changed the data types to Nominal data types through " weka>>filters>>unsupervised>>attribute>>NumericToNominal " . But , in the "Associate " tab , Apriori rule can  not be used , because the "start" button is disabled . </p>
  
  <p>How can I solve these problem ? Is there other restrictions to use Apriori rule in Weka tool ? ...</p>
  
  <p>Many thanks !</p>
  
  <p>Best regards,</p>
  
  <p>Anwar</p>