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Ph.D., Bowling Green State University, Bowling Green,
Ohio, 1975, Probability and Statistics
Dr. Tortora joined Gallup as its Chief Methodologist in July 1995. His main work includes conducting media research among Internet users, national and international (covering all continents) product concept development (demand and price), methodological research on incentives, nonresponse bias, mode affects, cultural bias, Random Digit Dial telephone coverage and dual frame surveys. In addition, while at Gallup Dr. Tortora has also conducted research on Internet panels, customer engagement, modeling e-loyalty and the design of Internet or World Wide Web surveys. Dr. Tortora is currently leading a major research project covering Eastern and Western Europe to design functionally equivalent questionnaires across all European Union member and candidate countries. Dr. Tortora teaches a graduate sampling course at the University of Nebraska, where he is Adjunct Professor in the Department of Mathematics and Statistics. He is an elected Fellow of the American Statistical Association. Prior to joining Gallup, Dr. Tortora was the Associate Director for Statistical Design, Methodology and Standards at the US Bureau of the Census. In this position, he was leading all aspects of the design and implementation of the 2000 Census, dealt with advocacy groups, the media and Census 2000 public relations. In addition he was responsible for statistical and survey methodology for all Census Bureau programs including major demographic and health surveys, development of statistical and survey standards, and career management and training programs for mathematical statisticians and survey methodologists. While at the US Department of Agriculture Dr. Tortora was the lead methodologist on two USAID PASA for Latin America and the Middle East. He also lectured and trained host country personnel to build in-country capacity in survey methods.
"Incentives in Internet Surveys" , presented at the 2000 Annual Meeting of the American Statistical Association, Atlanta, GA, with S. Russo. "Influence of Plain vs. Fancy Design on Response Rates for Web Surveys", The 1998 Proceedings American Statistical Associations Survey Methods Research Section, Washington DC, with Don A. Dillman, Jon Conradt and Dennis Bowker. "Principles for Constructing WEB Surveys: Results of an Experiment", to appear in Gallup Research Journal, with Don Dillman and Dennis Bowker. "Reducing and Controlling Nonsampling Errors in Internet Surveys". Invited talk presented at a Special Session on On-line Advertising Research at the Association for Continuing Research and Journalism Education, 1998, Baltimore, Maryland. "Nonresponse Bias in Likert Scale Questions", 1998. In Statistical Case Studies: A Collaboration Between Academe and Industry, Editor, R. Peck. Special ASA/ SIAM Edited Volume, with R. Smidt. "Integrating CASIC into Existing Designs and Organizations: A Survey of the Field", 1998. Monograph of the International Conference on Computer-Assisted Survey Information Collection: InterCASIC '96, John Wiley and Sons, New York, with R. Groves.
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