I think getting the data isn&#x27;t hard,  but qualifying the data is.  (i.e. who is a good lead)<p>Right now I am looking at a spreadsheet of about 5,000 leads and it is one of about 4 I am about to feed into a machine learning model.<p>The state of the art is such that you ought to be able to build a good classifier with that much data,  but most people won&#x27;t seem to do the work.  I am hungry as hell though,  so I will.<p>One thing I know is that a relevance model is not good enough,  you also need an irrelevance model.