Forest Products Laboratory - USDA Forest Service

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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

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Steve P. Verrill

Statistics, Life Cycle Analysis, and Economics Research
Unit: FPL-4851
Mathematical Statistician
One Gifford Pinchot Drive
Madison, WI
United States
53726-2398

Phone: 608-231-9375
steve.p.verrill@usda.gov

Research Interest

X-ray determination of microfibril angle
Predictor-sort sampling
Coefficient of variation estimation and testing
Modeling air-drying of logs
Repetitive member reliability calculations

Below are the 66 US Forest Service publications sorted by year. You may re-sort the list by: Title, Date Posted, Category, Publication or Year.

Publication Year: 2021

*Title:* Fitting Statistical Distribution Models to MOE and MOR in Mill-Run Spruce and Red Pine Lumber Populations *Source: Wood and Fiber Science Author(s)* Anderson, Guangmei Cao; Owens, Frank C.; Verrill, Steve P.; Ross, Robert J.; Shmulsky, Rubin Year: 2021 view abstract, download publication »
*Title:* Improved models for predicting the modulus of rupture of lumber under third point loading *Source: FS Research Paper Author(s)* Verrill, Steve; Owens, Frank C.; Shmulsky, Rubin; Ross, Robert Year: 2021 view abstract, download publication »
*Title:* Java image analysis program for lumber knots, and related nonlinear least squares routines for fitting lumber modulus of rupture to strength predictors *Source: FS General Technical Report Author(s)* Verrill, Steve; Owens, Frank C.; Shmulsky, Rubin; Ross, Robert Year: 2021 view abstract, download publication »
Publication Year: 2020

*Title:* Distributions of MOE and MOR in eight mill-run lumber populations (four mills at two times) *Source: Wood and Fiber Science. 52(2): 165-177. Author(s)* Owens, Frank C.; Verrill, Steve P.; Shmulsky, Rubin ; Ross, Robert J. Year: 2020 view abstract, download publication »
*Title:* Estimated probability of breakage of lumber of a fixed “grade” can vary greatly from mill to mill and time to time *Source: Res. Pap. FPL-RP-705. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 47 p. Author(s)* Verrill, Steve P.; Owens, Frank C.; Arvanitis, Matthew A.; Kretschmann, David E.; Shmulsky, Rubin ; Ross, Robert J.; Lebow, Patricia Year: 2020 view abstract, download publication »
Publication Year: 2019

*Title:* Distributions of modulus of elasticity and modulus of rupture in four mill run lumber populations *Source: Wood and Fiber Science. 51(2): 183-192. Author(s)* Owens, Frank ; Verrill, Steve ; Shmulsky, Rubin ; Ross, Robert J. Year: 2019 view abstract, download publication »
*Title:* Simulations of nonparametric analyses of predictor sort (matched specimens) data *Source: Res. Pap. FPL-RP-699. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory: 1-83. Author(s)* Verrill, Steve P.; Kretschmann, David E. Year: 2019 view abstract, download publication »
*Title:* Visual and MSR grades of lumber are not 2-parameter Weibulls and why this may matter *Source: Journal of Testing and Evaluation. 48(5). 19 p. Author(s)* Verrill, Steve P.; Owens, Frank C.; Kretschmann, David E.; Shmulsky, Rubin ; Brown, Linda S. Year: 2019 view abstract, download publication »
*Title:* Visual and MSR grades of lumber are not two-parameter Weibulls and why it matters (with a discussion of censored data fitting) *Source: Res Pap. FPL-RP-703. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 40 p. Author(s)* Verrill, Steve P.; Owens, Frank C.; Kretschmann, David E.; Shmulsky, Rubin ; Brown, Linda S. Year: 2019 view abstract, download publication »
Publication Year: 2018

*Title:* A fit of a mixture of bivariate normals to lumber stiffness—strength data *Source: Res. Paper FPL-RP-696. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 1-46. Author(s)* Verrill, Steve P.; Owens, Frank C.; Kretschmann, David E.; Shmulsky, Rubin Year: 2018 view abstract, download publication »
*Title:* Distributions of MOE and MOR in a full lumber population *Source: Wood and Fiber Science. 50(3): 265-279. Author(s)* Owens, Frank C.; Verrill, Steve P.; Shmulsky, Rubin ; Kretschmann, David E. Year: 2018 view abstract, download publication »
Publication Year: 2017

*Title:* Effect of sample moisture content on XRD-estimated cellulose crystallinity index and crystallite size *Source: Cellulose. 24(5): 1971-1984. Author(s)* Agarwal, Umesh P.; Ralph, Sally A.; Baez, Carlos; Reiner, Richard S.; Verrill, Steve P. Year: 2017 view abstract, download publication »
*Title:* Reminder about potentially serious problems with a type of blocked ANOVA analysis *Source: Research Paper, FPL-RP-683. Madison, WI: USDA, Forest Service, Forest Products Laboratory. 117 p. Author(s)* Verrill, Steve; Kretschmann, David E. Year: 2017 view abstract, download publication »
*Title:* Simulations of solid lumber strength property monitoring tests *Source: FPL-RP-684. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 32 p. Author(s)* Verrill, Steve; Kretschmann, David E.; Evans, James W. Year: 2017 view abstract, download publication »
*Title:* Statistical models for the distribution of modulus of elasticity and modulus of rupture in lumber with implications for reliability calculations *Source: Res. Pap. FPL-RP-692. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 51 p. Author(s)* Verrill, Steve P.; Owens, Frank C.; Kretschmann, David E.; Shmulsky, Rubin Year: 2017 view abstract, download publication »
Publication Year: 2016

*Title:* JMFA3--confirmation study looking into rotation and tilt effects on x-ray diffraction microfibril angle estimation *Source: fplrip-4851-017-UW-Verrill-Kretschmann-Evans Author(s)* Evans, Paul G.; Verrill, Steve; Kretschmann, David E. Year: 2016 view abstract, download publication »
*Title:* Maximum likelihood estimation of the parameters of a bivariate Gaussian-Weibull distribution from machine stress-rated data *Source: USDA Forest Service, Forest Products Laboratory, Research Paper, FPL-RP-685 Author(s)* Verrill, Steve P.; Kretschmann, David E.; Evans, James W. Year: 2016 view abstract, download publication »
Publication Year: 2015

*Title:* Acoustic Evaluation of Thinning and Biosolid Fertilization Effects on Wood Quality of a Douglas-fir stand *Source: USDA Forest Service, Forest Products Laboratory, General Technical Report, FPL-GTR-239, 2015; pp. 365-377. Author(s)* Wang, Xiping; Ross, Robert J.; Verrill, Steve; Lowell, Eini; Barbour, Jamie Year: 2015 view abstract, download publication »
*Title:* Asymptotically Efficient Estimation of a Bivariate Gaussian-Weibull Distribution and an Introduction to the Associated Pseudo-truncated Weibull *Source: Communications in Statistics - Theory and Methods Author(s)* Verrill, Steve P.; Evans, James W.; Kretschmann, David E.; Hatfield, Cherilyn A. Year: 2015 view abstract, download publication »
*Title:* Problems with a Type of Matched Subjects Design and Analysis *Source: In: Proceedings of the 2015 American Statistical Association Joint Statistical Meetings, Section on Physical and Engineering Sciences, pages 3491-3505 Author(s)* Verrill, Steve P.; Kretschmann, David E. Year: 2015 view abstract, download publication »
Publication Year: 2014

*Title:* Reliability Implications in Wood Systems of a Bivariate Gaussian-Weibull Distribution and the Associated Univariate Pseudo-truncated Weibull *Source: Journal of Testing and Evaluation, Volume 42, Number 2, MARCH 2014; 9 p. Author(s)* Verrill, Steve P.; Evans, James W.; Kretschmann, David E.; Hatfield, Cherilyn A. Year: 2014 view abstract, download publication »
Publication Year: 2013

*Title:* Acoustic sorting models for improved log segregation *Source: Wood and Fiber Science, Volume 45, Number 4, 2013; pp 343–352 Author(s)* Wang, Xiping; Verrill, Steve; Lowell, Eini; Ross, Robert J.; Herian, Vicki L. Year: 2013 view abstract, download publication »
*Title:* An Evaluation of a Proposed Revision of the ASTM D 1990 Grouping Procedure *Source: USDA Forest Service, Forest Products Laboratory, Research Paper, FPL-RP-671, 2013. 36 p. Author(s)* Verrill, Steve P; Evans, James W.; Kretschmann, David E.; Hatfield, Cherilyn A. Year: 2013 view abstract, download publication »
*Title:* Durability of Hardboard Lap Siding *Source: USDA Forest Service, Forest Products Laboratory, Research Paper, FPL-RP-674, 2013; 29 p. Author(s)* Carll, Charles; Boardman, Charles R.; Verrill, Steve P. Year: 2013 view abstract, download publication »
Publication Year: 2012

*Title:* Approaching zero cellulose loss in cellulose nanocrystal (CNC) production: recovery and characterization of cellulosic solid residues (CSR) and CNC *Source: Cellulose, Published online: 22 August 2012. Author(s)* Wang, Q.Q.; Zhu, J.Y.; Reiner, R.S.; Verrill, S.P.; Baxa, U.; McNeil, S.E. Year: 2012 view abstract, download publication »
*Title:* Asymptotically efficient estimation of a bivariate Gaussian–Weibull distribution and an introduction to the associated pseudotruncated Weibull *Source: USDA Forest Service, Forest Products Laboratory, Research Paper, FPL-RP- 666, 2012: 78 p. Author(s)* Verrill, Steve P.; Evans, James W.; Kretschmann, David E.; Hatfield, Cherilyn A. Year: 2012 view abstract, download publication »
*Title:* Small Sample Properties of Asymptotically Efficient Estimators of the Parameters of a Bivariate Gaussian–Weibull Distribution *Source: USDA Forest Service, Forest Products Laboratory, Research Paper, FPL-RP-667, 2012: 48 p. Author(s)* Verrill, Steve P.; Evans, James W.; Kretschmann, David E.; Hatfield, Cherilyn A. Year: 2012 view abstract, download publication »
*Title:* Sources of Confusion in the Determination of ASTM Repetitive Member Factors for the Allowable Properties of Wood Products *Source: J. Struct. Eng. 2012.138:130-133 Author(s)* Verrill, S.; Kretschmann, D. Year: 2012 view abstract, download publication »
Publication Year: 2011

*Title:* Concerns about a Variance Approach to X-ray Diffractometric Estimation of Microfibril Angle in Wood *Source: Wood and Fiber Science, Volume 43, Number 2, 2011, pp. 153-168; 2011 Author(s)* Verrill, Steve P.; Kretschmann, David E.; Herian, Victoria L.; Wiemann, Michael C.; Alden, Harry A. Year: 2011 view abstract, download publication »
*Title:* On Polydispersity of Plant Biomass Recalcitrance and Its Effects on Pretreatment Optimization for Sugar Production *Source: Bioenerg. Res. (2011) 4:201-210; 2011 Author(s)* Zhu, J.Y.; Verrill, Steve V.; Liu, Hao; Herian, Victoria L.; Pan, Xuejun; Rockwood, Donald L. Year: 2011 view abstract, download publication »
Publication Year: 2010

*Title:* Concerns about a Variance Approach to the X-ray Diffractometric Estimation of Microfibril Angle in Wood *Source: USDA Forest Service, Forest Products Laboratory, Research Paper FPL-RP-658, 2010 Author(s)* Verrill; Steve P.; Kretschmann; David E.; Herian; Victoria L.; Wiemann; Michael; Alden; Harry A. Year: 2010 view abstract, download publication »
*Title:* Repetitive Member Factors for the Allowable Properties of Wood Products *Source: US Forest Service, Forest Products Laboratory, Research Paper FPL-RP-657, 2010 Author(s)* Verrill; Steve P.; Kretschmann; David E. Year: 2010 view abstract, download publication »
Publication Year: 2009

*Title:* Acoustic Sorting Models for Log Segregation *Source: In: Proceedings of the 16th international symposium on nondestructive testing and evaluation of wood. 2009 October 12-14. Beijing, China. Beijing Forestry University, Beijing, China. Dr. Houjian Zhang and Dr. Xiping Wang, eds. p. 45-51. Author(s)* Wang, Xiping; Verrill, Steve; Lowell, Eini; Ross, Robert; Herian, Vicki Year: 2009 view abstract, download publication »
*Title:* Heat-Treatment Options and Heating Times for Ash Firewood *Source: USDA Forest Service, Forest Products Laboratory, General Technical Report, FPL-GTR-187, October 2009 Author(s)* Xiping Wang; Richard Bergman; William T. Simpson; Steve Verrill; Terry Mace Year: 2009 view abstract, download publication »
*Title:* Material Variability and Repetitive Member Factors for the Allowable Properties of Engineered Wood Products *Source: Journal of Testing and Evaluation, Vol. 37, No. 6, pp. 1-9; 2009 Author(s)* Verrill, Steve; Kretschmann, David E.; Year: 2009 view abstract, download publication »
*Title:* Statistical Framework for Comparing Lumber Sorting Procedures *Source: USDA Forest Service, Forest Products Laboratory, Research Paper, FPL-RP-651, July 2009 Author(s)* Steve Verrill; Richard A. Johnson; James W. Evans Year: 2009 view abstract, download publication »
Publication Year: 2008

*Title:* Material variability and repetitive member allowable property adjustments in forest products engineering *Source: Research Paper FPL-RP-649. Madison, WI: U.S. Department of Agriculture,Forest Service, Forest Products Laboratory. 36 pages. Author(s)* Verrill, Steve; Kretschmann, David Year: 2008 view abstract, download publication »
*Title:* The distribution of McKay's approximation for the coefficient of variation *Source: Statistics & Probability Letters 78 (2008) 10 - 14 ; 2008 Author(s)* Forkman, Verrill Year: 2008 view abstract, download publication »
Publication Year: 2007

*Title:* Confidence bounds and hypothesis tests for normal distribution coefficients of variation *Source: Research Paper FPL-RP-638. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 57 pages Author(s)* Verrill, Steve P.; Johnson, Richard A. Year: 2007 view abstract, download publication »
*Title:* Confidence Bounds and Hypothesis Tests for Normal Distribution Coefficients of Variation *Source: Communications in Statistics-Theory and Methods, 36: 2187-2206, 2007 Author(s)* Verrill, Johnson Year: 2007 view abstract, download publication »
*Title:* Rate of convergence of k-step Newton estimators to efficient likelihood estimators *Source: Statistics & probability letters. Vol. 77 (2007): Pages 1371-1376. Author(s)* Verrill, Steve Year: 2007 view abstract, download publication »
Publication Year: 2006

*Title:* JMFA2-A Graphically Interactive Java Program That Fits Microfibril Angle X-ray Diffraction Data *Source: Research Paper FPL-RP-635. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 69 pages Author(s)* Verrill, Steve P.; Kretschmann, David E.; Herian, Victoria L. Year: 2006 view abstract, download publication »
Publication Year: 2005

*Title:* Improved utilization of small-diameter ponderosa pine in glulam timber *Source: Res. Pap. FPL-RP-625. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 38 p. Author(s)* Hernandez, Roland; Green, David W.; Kretschmann, David E.; Verrill, Steven P. Year: 2005 view abstract, download publication »
*Title:* The decline and fall of Type II error rates *Source: Research Paper FPL-RP-628. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 11 p. Author(s)* Verrill, Steve; Durst, Mark Year: 2005 view abstract, download publication »
*Title:* The Decline and Fall of Type II Error Rates *Source: The American Statician, November 2005, Vol. 59, No. 4, pp. 287-291; 2005 Author(s)* Verrill, Steve; Durst, Mark Year: 2005 view abstract, download publication »
Publication Year: 2004

*Title:* Estimating the board foot to cubic foot ratio *Source: Res. Pap. FPL-RP-616. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory: 18 pages Author(s)* Verrill, Steve P.; Herian, Victoria L.; Spelter, Henry N. Year: 2004 view abstract, download publication »
*Title:* Predictor Sort Sampling and Confidence Bounds on Quantiles I Asymptotic Theory *Source: FPL-RP-623, August 2004; Forest Products Laboratory Research Paper Author(s)* Verrill, Steve; Herian, Victoria L.; Green, David W. Year: 2004 view abstract, download publication »
Publication Year: 2003

*Title:* Confidence bounds for normal and lognormal distribution coefficients of variation *Source: Res. Pap. FPL-RP-609. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory: 13 pages Author(s)* Verrill, Steve Year: 2003 view abstract, download publication »
*Title:* Heat sterilization time of ponderosa pine and Douglas-fir boards and square timbers *Source: Res. Pap. FPL-RP-607. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 24 p. Author(s)* Simpson, William T.; Wang, Xiping; Verrill, Steve Year: 2003 view abstract, download publication »
Publication Year: 2002

*Title:* Predictor sort sampling and one-sided confidence bounds on quantiles *Source: Proceedings, 2001 American Statistical Association Annual Meeting, Physical Sciences and Engineering Section, 2001 August 5-9, Atlanta, GA. Alexandria, VA : American Statistical Association, 2002. Author(s)* Verrill, Steve; Herian, Victoria L.; Green, David W. Year: 2002 view abstract, download publication »
Publication Year: 2001

*Title:* An inverse moisture diffusion algorithm for the determination of diffusion coefficient *Source: Drying technology. Vol. 19, no. 8 (2001): Pages 1555-1568 Author(s)* Liu, Jen Y.; Simpson, William T.; Verrill, Steve P. Year: 2001 view abstract, download publication »
*Title:* Rolling your own : linear model hypothesis testing and power calculations via the singular value decomposition *Source: [Statistical computing & statistical graphics newsletter]. Vol. 12, no. 1 [2001]: Pages 15-18 Author(s)* Verrill, Steve Year: 2001 view abstract, download publication »
Publication Year: 2000

*Title:* An inverse moisture diffusion algorithm for the determination of diffusion coefficient *Source: [Proceedings of the 12th International Drying Symposium IDS2000 : 28-31 August 2000 : Noordwijkerhout, The Netherlands. Amsterdam, The Netherlands : Elsevier, 2000].:9 p. : ill. Author(s)* Liu, Jen Y.; Simpson, William T.; Verrill, Steve P. Year: 2000 view abstract, download publication »
*Title:* Estimating Dry-Kiln Schedules for Hardwoods *Source: USDA Forest Service, Forest Products Laboratory, Techlines, 2000 Author(s)* Simpson, William; Verrill, Steve Year: 2000 view abstract, download publication »
Publication Year: 1999

*Title:* When Good Confidence Intervals Go Bad: Predictor Sort Experiments and ANOVA *Source: The American Statistician, February 1999, Volume 53, Number 1; pp. 38-42. Author(s)* Verrill, Steve Year: 1999 view abstract, download publication »
Publication Year: 1998

*Title:* Influence of Cambial Age and Growth Conditions on Microfibril Angle in Young Norway Spruce (Picea abies [L.] Karst.) *Source: Holzforschung, 52 (1998) 573-581 Author(s)* Lindstrom, Hakan; Evans, James W.; Verrill, Steve P. Year: 1998 view abstract, download publication »
Publication Year: 1997

*Title:* Estimating kiln schedules for tropical and temperate hardwoods using specific gravity *Source: Forest Prod. J. 47(7/8):64-68 Author(s)* Simpson, William T.; Verrill, Steve P. Year: 1997 view abstract, download publication »
*Title:* TT : a program that implements predictor sort design and analysis *Source: General Technical Report FPL-GTR-101):21 p. ; 28 cm. Author(s)* Verrill, S. P.; Green, D. W.; Herian, V. L. Year: 1997 view abstract, download publication »
*Title:* Variations of microfibril angle in loblolly pine: comparison of iodine crystallization and x-ray diffraction techniques *Source: Proc of the IAWA/IUFRO Intl Workshop on the Significance of Microfibril Angle to Wood Quality; Westport, New Zealand, November 1997; pp. 157-177 Author(s)* Kretschmann, David E.; Alden, Harry A.; Verrill, Steve Year: 1997 view abstract, download publication »
Publication Year: 1996

*Title:* Predictor sort sampling, tight t`s, and the analysis of covariance : theory, tables, and examples *Source: (Research paper FPL-RP-558):105 p. : ill. ; 28 cm. Author(s)* Verrill, S. P.; Green, D. W. Year: 1996 view abstract, download publication »
*Title:* VACUUM-PRESSURE SOAK PLUS OVENDRY AS AN ACCELERATED-AGING TEST FOR WOOD-BASED PANEL PRODUCTS *Source: Forest Prod. J. 46(9):84-88. Author(s)* Karlsson, Per O.A.; McNatt, J. Dobbin; Verrill, Steven P. Year: 1996 view abstract, download publication »
Publication Year: 1995

*Title:* GAS PERMEABILITY OF PLANTATION LOBLOLLY PINE *Source: Wood and Fiber Science. 27(1), 1995, pp. 34-40 Author(s)* Milota, Michael R.; Tschernitz, John L.; Verrill, Steve P.; Mianowski, Theodore Year: 1995 view abstract, download publication »
*Title:* Laboratory test for grouping tropical species for kiln drying *Source: Wood Science and Technology, Vol. 29, 1995, pp. 353-362 Author(s)* Mendes, A. de Souza; Simpson, W. T.; Verrill, S. P. Year: 1995 view abstract, download publication »
Publication Year: 1993

*Title:* Predictor sort sampling, Tight T's and the Analysis of covariance *Source: Journal of the American Statistical Association March 1993. Volume 88 Number 421. 1993; pp. 119-124. Author(s)* Verrill, Steven Year: 1993 view abstract, download publication »
Publication Year: 1991

*Title:* Bending Properties of Reinforced and Unreinforced Spliced Nail-Laminated Posts *Source: FPL-RP-503, August 1991; Forest Products Laboratory Research Paper Author(s)* Bohnhoff, David R.; Moody, Russell C.; Verrill, Steve P.; Shirek, Leo F. Year: 1991 view abstract, download publication »
Publication Year: 1983

*Title:* Mechanical Properties of Longleaf Pine Treated with Waterborne Salt Preservative *Source: FPL-RP-434, August 1983; Forest Products Laboratory Research Paper Author(s)* Bendtsen, B.A.; Gjovik, L.R.; Verrill, S.P. Year: 1983 view abstract, download publication »


*Publication Year: 2013*
Highlight ID: 440	Traditional Grading System Updated for Structural Lumber The Forest Products Laboratory has traditionally provided unbiased information on the properties, characteristics, design, and use of structural wood products to groups and agencies that develop or control standards for ensuring public safety and hea ...

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