By Tim Graettinger, Ph.D., President of Discovery Corps, Inc. (http://www.discoverycorpsinc.com), a Pittsburgh-area company specializing in data mining, visualization, and predictive analytics. For the past year, I have presented a data mining “nuts and bolts” session during a monthly webinar[1].  My favorite part is the question-and-answer portion at the end.  In a previous article[2], you learn…