Mark Tygert's homepage


Selected technical reports

  1. William Perkins, Mark Tygert, and Rachel Ward, "Computer-enabled metrics of statistical significance for discrete data," November 2013: pdf.

    This monograph collects together all our work on significance testing.

  2. Mark Tygert and Rachel Ward, "Testing goodness-of-fit for logistic regression," Technical Report 1306.0959, arXiv, June 2013: pdf.

    This article resolves many issues with the standard Hosmer-Lemeshow tests.

  3. William Perkins, Mark Tygert, and Rachel Ward, "Significance testing without truth," Technical Report 1301.1208, arXiv, January 2013: pdf.

    This article has major antecedents in the work of D. R. Cox.

  4. Jacob Carruth, Mark Tygert, and Rachel Ward, "A comparison of the discrete Kolmogorov-Smirnov statistic and the Euclidean distance," Technical Report 1206.6367, arXiv, June 2012: pdf.

    This article provides a guide to choosing between the discrete Kolmogorov-Smirnov statistic and the root-mean-square.

  5. William Perkins, Gary Simon, and Mark Tygert, "Computing the asymptotic power of a Euclidean-distance test for goodness-of-fit," Technical Report 1206.6378, arXiv, June 2012: pdf.

    This article provides an efficient numerical method for plotting the asymptotic power function of a root-mean-square test for goodness-of-fit in the limit of large numbers of observations (as a function of the significance level). This follows up on our earlier paper, "χ2 and classical exact tests often wildly misreport significance; the remedy lies in computers," which is available below.

  6. Mark Tygert, "Testing the significance of assuming homogeneity in contingency-tables/cross-tabulations," Technical Report 1201.1421, arXiv, January 2012: pdf.

    This article analyzes homogeneity in contingency-tables/cross-tabulations using the approach of our earlier paper, "χ2 and classical exact tests often wildly misreport significance; the remedy lies in computers," which is available below.

  7. William Perkins, Mark Tygert, and Rachel Ward, "χ2 and classical exact tests often wildly misreport significance; the remedy lies in computers," Technical Report 1108.4126, arXiv, August 2011; updated, abbreviated version: pdf; extended version: pdf.

    This article is the leading and largest salvo in our crusade against the Pearson χ2 test. This is the place to start.

  8. William Perkins, Mark Tygert, and Rachel Ward, "Computing the confidence levels for a root-mean-square test of goodness-of-fit, II," Technical Report 1009.2260, arXiv, September 2010: pdf, ps.

    This article extends its predecessor (which is available here); the models in the new paper involve parameter estimation.

  9. Mark Tygert, "Analogues for Bessel functions of the Christoffel-Darboux identity," Technical Report 1351, Yale University, Department of Computer Science, March 2006: pdf, ps.

    Many thanks to Professor F. W. J. Olver of the University of Maryland for pointing out formula 57.21.1 in E. R. Hansen's A Table of Series and Products, which provides a more general formulation of one of the analogues (thus obviating the need for publishing this technical report).