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Title Maximum likelihood estimation of the parameters of a bivariate Gaussian-Weibull distribution from machine stress-rated data / Steve P. Verrill, et al.

Imprint Madison, WI. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, [2016]


Location Call No. OPAC Message Status
 Axe Federal Documents Online  A 13.78:FPL-RP-685    ---  Available
Description 21, [51] p. ; 28 cm.
Series Research paper FPL-RP ; 685
Research paper FPL-RP ; 685.
Note Cover title.
"July 2016".
Form Also available on the World Wide Web.
Bibliography Includes bibliographical references (p. 12-14).
Summary Two important wood properties are stiffness (modulus of elasticity, MOE) and bending strength (modulus of rupture, MOR). In the past, MOE has often been modeled as a Gaussian and MOR as a lognormal or a two- or three parameter Weibull. It is well known that MOE and MOR are positively correlated. To model the simultaneous behavior of MOE and MOR for the purposes of wood system reliability calculations, a 2012 paper by Verrill, Evans, Kretschmann, and Hatfield introduced a bivariate Gaussian--Weibull distribution and the associated pseudo-truncated Weibull. In that paper, they obtained an asymptotically efficient estimator of the parameter vector of the bivariate Gaussian--Weibull. This estimator requires data from the full bivariate MOE, MOR distribution. In practice, such data are often not available. Instead, in some cases "Machine Stress-Rated" (MSR) data are available. An MSR data set consists of MOE, MOR pairs, where a pair is accepted into the data set (a piece of lumber is accepted) if and only if the MOE value lies between predetermined lower and upper bounds. For such a data set, the asymptotically efficient methods appropriate for a full data set cannot be used. In this paper we present an approach that is effective for MSR data.
Subject Modulus of elasticity
Bending strength
Weibull distribution.
Gaussian distribution.
Wood -- Elastic properties -- Computer simulation.
Wood -- Mechanical properties -- Computer simulation.
Flexure -- Computer simulation.
Strength of materials -- Computer simulation.
Added Author Evans, James W.
Kretschmann, David E.
Verrill, Steven P.
Forest Products Laboratory (U.S.)
Sudoc No. A 13.78:FPL-RP-685

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