I am currently an educational/statistical consultant for SPSS, an IBM Co. I am an IBM Certified trainer in SPSS and Modeler and teach SPSS and Modeler classes part-time for IBM. I retired from IRS in Dec. 2007, after 32 years with the U.S. Federal Government. At IRS, I was known as “Mr. DIF” because of my leadership, oversight, and hands-on development of IRS’ discriminant function (DIF) statistical models for selecting all types of tax compliance workload. At IRS, I also accumulated exten
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