Steve Verrill

sverrill@fs.fed.us

(608) 217-8408                                

U.S.D.A. Forest Products Laboratory           
1 Gifford Pinchot Drive                       
Madison, WI 53726


Employment

1988 to the present:

Mathematical Statistician, U.S.D.A. Forest Products Laboratory

Responsibilities and Expertise

1987 to 1988:

Group Leader, Statistics and Probability Group, Computing and Mathematics Research Division, Lawrence Livermore National Laboratory

1981 to 1988:

Mathematician, Lawrence Livermore National Laboratory

Responsibilities and Expertise

1979 to 1981:

Mathematical Statistician, U.S.D.A. Forest Products Laboratory

1976 to 1981:

Teaching and Research Assistant, Statistics Department, University of Wisconsin - Madison


Education

Ph.D. in statistics from the University of Wisconsin - Madison, 1981

M.A. in mathematics from the University of Wisconsin - Madison, 1979

B.A. in mathematics from the University of Wisconsin - Madison, 1976.
Graduated with honors.


Computing Experience


Publications

  1. Verrill and Johnson (1982), "The Asymptotic Distribution of a Special Quadratic Form," UW-Madison Department of Statistics Technical Report 698.
  2. Verrill and Johnson (1983), "The Asymptotic Distributions of Censored Data Versions of the Shapiro-Wilk Test of Normality Statistic," UW-Madison Department of Statistics Technical Report 702.
  3. Bendtsen, Gjovik, and Verrill (1983), "Mechanical Properties of Longleaf Pine Treated with Waterborne Salt Preservatives," USDA Forest Service Forest Products Laboratory Research Paper #434.
  4. Verrill (1983), "Minitab," Tentacle, 3(2), 7-8. (Tentacle is a Lawrence Livermore National Laboratory publication.)
  5. Verrill (1984), "A General Linear Models Program," Tentacle, 4(12), 1-6.
  6. Verrill (1985), "Power Calculations and GLM2," Tentacle, 5(4), 11-13.
  7. Violet, Verrill, Balaban, and Borg (1986), "The 57 Fe Magnetic Hyperfine Field in Au-Fe Alloys," Hyperfine Interactions, 28, 985-988.
  8. Verrill (1986), "Normal Probability Plots and the Shapiro-Wilk Test of Normality," Tentacle, 6(8), 1-6.
  9. Verrill and Johnson (1987), "The Asymptotic Equivalence of Some Modified Shapiro-Wilk Statistics -- Complete and Censored Sample Cases," Annals of Statistics, 15, 413-419.
  10. Johnson, Verrill, and Moore (1987), "Two Sample Rank Tests for Detecting Changes in a Small Proportion of the Treated Population," Biometrics, 43, 641-655.
  11. Verrill (1987), "NREG: A Nonlinear Regression Package," Tentacle, 7(4), 27-31.
  12. Verrill and Johnson (1987), "A Large Sample Approximation to the Distribution of a Modified Shapiro-Wilk Statistic Under Right Censoring," Lawrence Livermore National Laboratory UCRL-97603.
  13. Axelrod, Verrill, Patrick, and Yow (1988), "A Monte Carlo Investigation of a Proposed Screen for NX-Borehole Jack Data," The ASTM Geotechnical Testing Journal, 11, 20-29.
  14. Verrill and Johnson (1988), "Tables and Large Sample Distribution Theory for Censored Data Correlation Statistics for Testing Normality," Journal of the American Statistical Association, 83, 1192-1197.
  15. Verrill and Johnson (1988), "Asymptotic Distributions for Quadratic Forms with Applications to Censored Data Tests of Fit," Communications in Statistics - Theory and Methods, 17.
  16. Verrill and Durst (1988), "Probability Models of the MSAD Arming Process," Lawrence Livermore National Laboratory technical report.
  17. Verrill and Hickman (1988), "Elementary Sources of Concurrency in a Standard Quasi-Newton Unconstrained Nonlinear Optimization Algorithm," Lawrence Livermore National Laboratory UCID-21511.
  18. Verrill, Axelrod, and Durst (1990), "We've Got the Positive Correlation BLUEs," The American Statistician, 44, 171-173.
  19. Bohnhoff, Moody, Verrill, and Shirek (1990), "Influence of Butt Joints and Their Reinforcement on Nail-Laminated Post Properties," Proceedings of the 1990 International Summer Meeting of the American Society of Agricultural Engineers, June 24-27, Ohio Center, Columbus, Ohio.
  20. Bohnhoff, Moody, Verrill, and Shirek (1991), "Bending Properties of Reinforced and Unreinforced Spliced Nail-Laminated Posts," USDA Forest Service Forest Products Laboratory Research Paper #503.
  21. Johnson and Verrill (1991), "The Large Sample Distribution of the Shapiro-Wilk Statistic and its Variants Under Type I or Type II Right Censoring," Statistics and Probability Letters, 12, 405-413.
  22. Verrill (1993), "Predictor Sort Sampling, Tight T's, and the Analysis of Covariance," The Journal of the American Statistical Association, 88, 119-124.
  23. Urbanik, Lee, Laufenberg, and Verrill (1993), "Combined Board Performance Under Cyclic Humidity Conditions. Task II - Combined Board Testing," Report to the CKPG consortium.
  24. Anderson, Durst, Fienberg, Hardin, and Verrill (1993), "We Cannot Ensure Quality With Certification," Amstat News, no. 203, November, 15-16.
  25. Verrill (1994), Invited Comment on "Statistical Values, Quality, and Certification" by Peter Imrey, The American Statistician, 48, 78-79.
  26. Efron, Fienberg, Freedman, Tanner, and Verrill (1994), "Survey on Certification Follow-Up: Certification a `Very Bad Idea,' " Amstat News, no. 213, October, 11.
  27. Milota, Tschernitz, Verrill, and Mianowski (1995), "Gas Permeability of Plantation Loblolly Pine," Wood and Fiber Science, 27, 34-40.
  28. Kuskowski, Lee, and Verrill (1995), "Hygroexpansivity - Papermaking Variables and Corrugated Container Stacking Behavior. Final Report CKPG Project 3686-1 Phase III," Report to the CKPG consortium.
  29. De Souza Mendes, Simpson, and Verrill (1995), "Laboratory Test for Grouping Tropical Species for Kiln Drying," Wood Science and Technology, 29, 353-362.
  30. Karlsson, McNatt, and Verrill (1996), "Vacuum-Pressure Soak Plus Ovendry as an Accelerated-Aging Test for Wood-Based Panel Products," Forest Products Journal, 46, 84-88.
  31. Verrill and Green (1996), "Predictor Sort Sampling, Tight t's, and the Analysis of Covariance: Theory, Tables, and Examples," USDA Forest Service Forest Products Laboratory Research Paper #558.
  32. Verrill, Green, and Herian (1997), "TT: A Program That Implements Predictor Sort Design And Analysis," USDA Forest Service Forest Products Laboratory General Technical Report #101.
  33. Simpson and Verrill (1997), "Estimating Kiln Schedules for Tropical and Temperate Hardwoods Using Specific Gravity," Forest Products Journal, 47, 64-68.
  34. Kretschmann, Alden, and Verrill (1998), "Variations of Microfibril Angle in Loblolly Pine: Comparison of Iodine Crystallization and X-ray Diffraction Techniques," The Proceedings of the IAWA/IUFRO International Workshop on the Significance of Microfibril Angle to Wood Quality, November 1997, Westport, New Zealand, B.G. Butterfield, ed., 157-176.
  35. Lindstrom, Evans, and Verrill (1998), "Influence of Cambial Age and Growth Conditions on Microfibril Angle in Young Norway Spruce (Picea abies [L.] Karst.), Holzforschung, 52, 573-581.
  36. Verrill (1999), "When Good Confidence Intervals Go Bad: Predictor Sort Experiments and ANOVA," The American Statistician, 53, 38-42.
  37. Verrill, Green, and Herian (2000), "Power Calculations in the Predictor Sort Computer Program," USDA Forest Service Forest Products Laboratory Research Note #277.
  38. Verrill, Kretschmann, and Herian (2001), "JMFA -- A Graphically Interactive Java Program that Fits Microfibril Angle X-ray Diffraction Data," USDA Forest Service Forest Products Laboratory Research Note #283.
  39. Verrill (2001), "Rolling Your Own: Linear Model Hypothesis Testing and Power Calculations via the Singular Value Decomposition," Statistical Computing and Statistical Graphics Newsletter, 12, no. 1, 15-18.
  40. Verrill, Herian, and Green (2002), "Predictor Sort Sampling and One-sided Confidence Bounds on Quantiles," Proceedings of the Physical Sciences and Engineering Section at the 2001 American Statistical Association Annual Meetings, August 2-9, Atlanta, Georgia.
  41. Simpson, Wang, and Verrill (2003), "Heat Sterilization Time of Ponderosa Pine and Douglas-Fir Boards and Square Timbers," USDA Forest Service Forest Products Laboratory Research Paper #607.
  42. Verrill (2003), "Confidence Bounds for Normal and Lognormal Distribution Coefficients of Variation," USDA Forest Service Forest Products Laboratory Research Paper #609.
  43. Verrill, Herian, and Spelter (2004), "Estimating the Board Foot to Cubic Foot Ratio," USDA Forest Service Forest Products Laboratory Research Paper #616.
  44. Verrill, Herian, and Green (2004), "Predictor Sort Sampling and Confidence Bounds on Quantiles I: Asymptotic Theory," USDA Forest Service Forest Products Laboratory Research Paper #623.
  45. Hernandez, Green, Kretschmann, and Verrill (2005), "Improved Utilization of Small-Diameter Ponderosa Pine in Glued-Laminated Timber," USDA Forest Service Forest Products Laboratory Research Paper #625.
  46. Verrill and Durst (2005), "The Decline and Fall of Type II Error Rates," USDA Forest Service Forest Products Laboratory Research Paper #628.
  47. Verrill and Durst (2005), "The Decline and Fall of Type II Error Rates," The American Statistician, 59, No. 4, 287-291.
  48. Verrill, Kretschmann, and Herian (2006), "JMFA 2 --- A Graphically Interactive Java Program That Fits Microfibril Angle X-ray Diffraction Data," USDA Forest Service Forest Products Laboratory Research Paper #635.
  49. Verrill and Johnson (2007), "Confidence Bounds and Hypothesis Tests for Normal Distribution Coefficients of Variation," USDA Forest Service Forest Products Laboratory Research Paper #638.
  50. Verrill and Johnson (2007), "Confidence Bounds and Hypothesis Tests for Normal Distribution Coefficients of Variation," Communications in Statistics, Theory and Methods, 36, no. 12, 2187-2206.
  51. Verrill (2007), "Rate of Convergence of k-Step Newton Estimators to Efficient Likelihood Estimators," Statistics and Probability Letters, 77, 1371-1376.
  52. Forkman and Verrill (2008), "The Distribution of McKay's Approximation for the Coefficient of Variation," Statistics and Probability Letters, 78, 10-14.
  53. Verrill and Kretschmann (2008), "Material Variability and Repetitive Member Allowable Property Adjustments in Forest Products Engineering," USDA Forest Service Forest Products Laboratory Research Paper #649.
  54. Verrill, Johnson, and Evans (2009), "A Statistical Framework for Comparing Lumber Sorting Procedures," USDA Forest Service Forest Products Laboratory Research Paper #651.
  55. Verrill and Kretschmann (2009), "Material Variability and Repetitive Member Factors for the Allowable Properties of Engineered Wood Products," ASTM Journal of Testing and Evaluation, 37, no. 6.
  56. Wang, Bergman, Simpson, Verrill, and Mace (2009), "Heat Treatment Options and Heating Times for Ash Firewood," USDA Forest Service Forest Products Laboratory General Technical Report #187.
  57. Verrill and Kretschmann (2010), "Repetitive Member Factors for the Allowable Properties of Wood Products," USDA Forest Service Forest Products Laboratory Research Paper #657.
  58. Verrill, Kretschmann, Herian, and Wiemann (2010), "Concerns about a Variance Approach to the X-ray Diffractometric Estimation of Microfibril Angle in Wood," USDA Forest Service Forest Products Laboratory Research Paper #658.
  59. Wang, Verrill, Lowell, Ross, and Herian (2010), "Acoustic Sorting Models for Log Segregation," Proceedings of the 16th International Symposium on Nondestructive Testing and Evaluation of Wood, Oct. 12-14th, Beijing Forestry University, Beijing, China, Dr. Houjian Zhang and Dr. Xiping Wang, eds., 45-51.
  60. Zhu, Verrill, Liu, Herian, Pan, and Rockwood (2011), "On Polydispersity of Plant Biomass Recalcitrance and Its Effects on Pretreatment Optimization for Sugar Production," Bioenerg. Res., 4:201-210.
  61. Verrill, Kretschmann, Herian, Wiemann, and Alden (2011), "Concerns about a Variance Approach to X-ray Diffractometric Estimation of Microfibril Angle in Wood," Wood and Fiber Science, 43(2), pages 153-168.
  62. Verrill and Kretschmann (2012), "Sources of Confusion in the Determination of ASTM Repetitive Member Factors for the Allowable Properties of Wood Products," Journal of Structural Engineering , 138(1), 130--133.
  63. Verrill, Evans, Kretschmann, and Hatfield (2012), "Asymptotically Efficient Estimation of a Bivariate Gaussian--Weibull Distribution and an Introduction to the Associated Pseudo-truncated Weibull," USDA Forest Service Forest Products Laboratory Research Paper FPL-RP-666, 76 pages.
  64. Verrill, Evans, Kretschmann, and Hatfield (2012), "Small Sample Properties of Asymptotically Efficient Estimators of the Parameters of a Bivariate Gaussian--Weibull Distribution," USDA Forest Service Forest Products Laboratory Research Paper FPL-RP-667, 46 pages.
  65. Verrill, Evans, Kretschmann, and Hatfield (2012), "Asymptotically Efficient Estimation of a Bivariate Gaussian--Weibull Distribution and an Introduction to the Associated Pseudo-truncated Weibull," Proceedings of the 2012 Joint Statistical Meetings, Section on Engineering and Physical Sciences, San Diego, CA, pages 2250--2264.
  66. Wang, Zhu, Reiner, Verrill, Baxa, and McNeil (2012), "Approaching zero cellulose loss in cellulose nanocrystal (CNC) production: recovery and characterization of cellulosic solid residues (CSR) and CNC," Cellulose, 19, pages 2033--2047.
  67. Verrill, Evans, Kretschmann, and Hatfield (2013), "An Evaluation of a Proposed Revision of the ASTM D 1990 Grouping Procedure," USDA Forest Service Forest Products Laboratory Research Paper FPL-RP-671, 34 pages.
  68. Zhu, Wang, Reiner, Verrill, Considine, Baxa, and McNeil (2013), "High Yield and Zero Cellulose Loss in Cellulose Nanocrystal (CNC) Production: Cellulose Nanofibrils (CNF) from a CNC Production Waste Stream," Production and Applications of Cellulose Nanomaterials, p. 201-203, Postek, Moon, Rudie, and Bilodeau, eds., TAPPI Press, Peachtree Corners, Georgia, USA.
  69. Carll, Boardman, and Verrill (2013), "Durability of Hardboard Lap Siding -- Performance in Laboratory Testing and in Long-Term Exterior Exposure," USDA Forest Service Forest Products Laboratory Research Paper FPL-RP-674, 25 pages.
  70. Wang, Verrill, Lowell, Ross, and Herian (2013), "Acoustic Sorting Models for Improved Log Segregation," Wood and Fiber Science, 45, No. 4, 343--352.
  71. Verrill, Evans, Kretschmann, and Hatfield (2014), "Reliability Implications in Wood Systems of a Bivariate Gaussian--Weibull Distribution and the Associated Univariate Pseudo-truncated Weibull," ASTM Journal of Testing and Evaluation, 42, No. 2, 412--419.
  72. Verrill, Evans, Kretschmann, and Hatfield (2015), "Asymptotically Efficient Estimation of a Bivariate Gaussian--Weibull Distribution and an Introduction to the Associated Pseudo-truncated Weibull," Communications in Statistics -- Theory and Methods, 44: 2957--2975.
  73. Wang, Ross, Verrill, Lowell, and Barbour (2015), "Acoustic Evaluation of Thinning and Biosolid Fertilization Effects on Wood Quality of a Douglas-fir Stand," Proceedings of the 19th International Nondestructive Testing and Evaluation of Wood Symposium and USDA Forest Service Forest Products Laboratory General Technical Report FPL-GTR-239, 13 pages.
  74. Verrill and Kretschmann (2015), "Problems with a Type of Matched Subjects Design and Analysis," Joint Statistical Meetings Proceedings, Section on Physical and Engineering Sciences. Alexandria, VA: American Statistical Association. 3491-3505.
  75. Verrill, Kretschmann, and Evans (2016), "Maximum Likelihood Estimation of the Parameters of a Bivariate Gaussian--Weibull Distribution from Machine Stress-Rated Data," USDA Forest Products Laboratory Research Paper FPL-RP-685, 72 pages.
  76. Agarwal, Ralph, Baez, Reiner, and Verrill (2017), "Effect of sample moisture content on XRD-estimated cellulose crystallinity index and crystallite size," Cellulose, Springer, 24:1971-1984.
  77. Verrill, Kretschmann, and Evans (2017), "Simulations of Solid Lumber Strength Property Monitoring Tests," USDA Forest Service Forest Products Laboratory Research Paper FPL-RP-684, 30 pages.
  78. Verrill and Kretschmann (2017), "Reminder about Potentially Serious Problems with a Type of Blocked ANOVA Analysis," USDA Forest Service Forest Products Laboratory Research Paper FPL-RP-683, 117 pages.
  79. Verrill, Owens, Kretschmann, and Shmulsky, "Statistical Models for the Distribution of Modulus of Elasticity and Modulus of Rupture in Lumber with Implications for Reliability Calculations," in editing, to appear as FPL-RP-692.
  80. Verrill and Kretschmann, "Simulations of Nonparametric Analyses of Predictor Sort (Matched Specimens) Data," in editing, to appear as an FPL research paper.



Referee

Applied Stochastic Models in Business and Industry, Biometrics, Communications in Statistics - Theory and Methods, Computational Statistics, Journal of the American Statistical Association, Journal of Computational Physics, Journal of the International Association of Wood Anatomists, Journal of Materials in Civil Engineering, Journal of Statistical Software, Progress in Paper Recycling, SIAM Journal on Scientific and Statistical Computing, Southern Journal of Applied Forestry, Statistical Methodology, Statistics and Probability Letters, Statistics in Medicine, Technometrics, The American Statistician, The Forest Products Journal, Wood and Fiber Science


Professional Affiliations

American Statistical Association, Society of Industrial and Applied Mathematics, Society of Wood Science and Technology


References

Professor Richard A. Johnson, UW-Madison Department of Statistics, Madison, Wisconsin (rich@stat.wisc.edu, 608-262-2357)

Dr. Mark Durst, Executive Director, Information Systems, Systems Informatics Group, Amgen, South San Francisco, California (mdurst@amgen.com, 650-244-2681)

Mr. Dave Kretschmann, Research General Engineer, USDA Forest Products Laboratory, Madison, Wisconsin (dkretschmann@fs.fed.us, 608-231-9307)