, VANWARD STATISTICS
Dr. Tollefson has over 20 years experience in technical and scientific fields. Her Ph.D. and M.S. in statistics are from Iowa State University and her B.A. in physics is from Reed College. She, also, has taken several courses in economics, both from Harvard University's extension college and, at the graduate level, from Iowa State University. Dr. Tollefson's dissertation was on the problem of nonresponse in survey samples.
