Zimmerman, D.W., & Williams, R.H. (1986). Modern elementary statistics with theoretical supplement and BASIC programming. Columbus, Ohio: American Sciences Press.
Zimmerman, D.W. (1985). Critique of AH5 group test of high grade intelligence. In Keyser, D.J. and Sweetland, R.C. (Eds.), Test critiques, Vol. IV, pp. 7-10. Kansas City, MO: Test Corporation of America.
Zimmerman, D.W., & Zumbo, B.D. (1993). The relative power of parametric and nonparametric statistical methods. In G. Keren & C. Lewis (Eds.), A handbook for data analysis in the behavioral sciences: Methodological issues. pp. 481-517. Hillsdale, NJ: Lawrence Erlbaum Associates.
Zimmerman, D.W. (2006). Commentary on Delprato. In B.D. Midgley & E.K. Morris (Eds.), Modern perspectives on J.R. Kantor and interbehaviorism. Reno, NV: Context Press.
Williams, R.H., Zimmerman, D.W., Ross, D.C., & Zumbo, B.D. (2006). Twelve British Statisticians. Boson Books.
Zimmerman, D.W. (2010). Scales of measurement and choice of statistical methods. International Encyclopedia of Statistical Methods.
The influence of two conditions on the secondary reinforcing potential of a discriminative stimulus, M.A. thesis, University of Illinois, 1956. Directed by O.H. Mowrer.
Sustained performance based on secondary reinforcement: An improved method with added controls, Ph.D. thesis, University of Illinois, 1958. Directed by O.H. Mowrer.
Zimmerman, D.W., & Mowrer, O.H. (1958). A method for obtaining longer-lasting secondary reinforcement. Midwestern Psychological Association, Chicago, IL.
Zimmerman, D.W. (1958). A procedure for establishing secondary reinforcement. Illinois Psychological Association, Springfield, IL.
Ray, A.J., & Zimmerman, D.W. (1970). Avoidance trial onset as a positive reinforcer. Western Psychological Association, Los Angeles, CA.
Frary, R.B., & Zimmerman, D.W. (1970). Probability of guessing correctly and variability of multiple-choice test scores. American Educational Research Association, Minneapolis, MN
Williams, R.H., & Zimmerman, D.W. (1979). Reconsideration of the attenuation paradox—and some new paradoxes in test validity. Eastern Educational Research Association, Norfolk, VA.
Williams, R.H., & Zimmerman, D.W. (1979). Error of measurement and statistical inference—some anomalies. Southern Society for Philosophy and Psychology, Birmingham, AL.
Williams, R.H., & Zimmerman, D.W. (1981). Gain scores in psychological research can be highly reliable. Southern Society for Philosophy and Psychology, Louisville, KY.
Frary, R.B., & Zimmerman, D.W. (1984). Elimination of bias in test scores. American Educational Research Association, Montreal, Canada.
Mazzagatti, R.D., Williams, R.H., & Zimmerman, D.W. (1986). Reliability of simple, residualized, and base-free gain scores. Eastern Educational Research Association, Miami Beach, FL.
Zumbo, B.D., & Zimmerman, D.W. (1989). The role of nonparametric statistics in psychological research: A study of the relative power of parametric and nonparametric methods. Colloquium, Department of Psychology, University of Victoria, Victoria, Canada.
Zumbo, B.D., & Zimmerman, D.W. (1989). The comparative power of parametric and nonparametric methods: Violation of parametric assumptions and levels of measurement. Colloquium, Department of Psychology, University of Alberta, Edmonton, Canada.
Zumbo, B.D., & Zimmerman, D.W. (1989). Theories of measurement and the selection of statistical methods: Implications for measurement theory, philosophy of science, and theories of meaningfulness. Colloquium, University of New Hampshire.
Zumbo, B.D., & Zimmerman, D.W. (1990). Grading in college and university courses: A psychometric perspective. Canadian Psychological Association, Ottawa, Canada.
Williams, R.H., & Zimmerman, D.W. (1991). Robust tests of differences between variances. Southern Society for Philosophy and Psychology, Atlanta, GA.
Williams, R.H., Zimmerman, D.W., & Zumbo, B.D. (1992). Correction of the Student t statistic for nonindependence of sample observations. Southern Society for Philosophy and Psychology, Memphis, TN.
Zumbo, B.D., Zimmerman, D.W., & Williams, R.H. (1992). Reliability of mesurement and power of significance tests based on differences. National Council on Measurement in Education, San Francisco, CA.
Williams, R.H., Zimmerman, D.W., & Zumbo, B.D. (1993). Relative power of the Wilcoxon test, the Friedman test, and repeated-measures ANOVA on ranks. Southern Society for Philosophy and Psychology, Memphis, TN.
Zumbo, B.D., Williams, R.H., & Zimmerman, D.W. (1993). Some recommendations for the analysis of two-wave data with difference scores. Southern Society for Philosophy and Psychology, New Orleans, LA.
Zimmerman, D.W., Williams, R.H., & Zumbo, B.D. (1993). Overall's paradox, statistical power, and reliability of differences. Southern Society for Philosophy and Psychology, New Orleans, LA.
Williams, R.H., Zimmerman, D.W., & Zumbo, B.D. (1994). Error of measurement, reliability, and the power of significance tests. Southern Society for Philosophy and Psychology, Atlanta, GA.
Williams, R.H., & Zimmerman, D.W. (1995). A more realistic appraisal of the reliability of simple gain scores. Rocky Mountain Psychological Association, Boulder, CO.
Williams, R.H., & Zimmerman, D.W. (1995). Reliability of measurement and power functions of parametric and nonparametric tests. Southern Society for Philosophy and Psychology, Virginia Beach, VA.
Williams, R.H., & Zimmerman, D.W. (1996). Type I error probabilities of parametric and nonparametric tests under multiple violation of assumptions. Southern Society for Philosophy and Psychology, Nashville, TN.
Williams, R.H., Zimmerman, D.W., Zumbo, B.D., & Cummings, N. (1996). How does measurement error influence statistical power? Southern Society for Philosophy and Psychology, Nashville, TN.
Williams, R.H., Zumbo, B.D., & Zimmerman, D.W. (2000). The life of R.A. Fisher. I. His scientific contributions. Southern Society for Philosohpy and Psychology, Atlanta, GA.
Zimmerman, D.W., & Zumbo, B.D. (2002). What to do when you are provided with both the pooled and separate variances t test results. American Educational Research Association, New Orleans, LA.
"Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing."—Thomas Huxley
"There is not a truth existing which I fear ...or would wish unknown to the whole world."—Thomas Jefferson
“It is fatal to allow social facts or forces to deform scientific theory”—J.R. Kantor
"The outcome of any serious research can only be to make two questions grow where only one grew before."—Thorstein Veblen