Marija Noruscaron;is earned a PhD in biostatistics from the University of Michigan. She was SPSS's first professional statistician. During this time, she wrote her first book,The SPSS Introductory Guide.Since then she has written numerous volumes of highly acclaimed SPSS documentation, and textbooks that demystify statistics and SPSS. Dr. Noruscaron;is has been on the faculties of the University of Chicago and Rush Medical College, teaching statistics to diverse audiences. When not working on SPSS guides, Marija analyzes real data as a statistical consultant. For more detailed information about Dr. Noruscaron;is and her SPSS guides, visit her website at www.norusis.com .