Comparison of Exclusion Values for Lumber Strength

Authors

  • W. G. Warren

Keywords:

statistical analysis, models

Abstract

There exists a temptation to utilize the distribution-free methods of ASTM D2915-70T for the comparison of the strengths of lumber populations, a use outside the intent of the standard. It is shown that the precision of such procedure is highly dependent on the form of the parent distribution of strength. Since this form is in general unknown, the confidence to be ascribed to inferences concerning near-minimum values of two lumber populations is also unknown and may well be inadequate.

References

Blom, G. 1958. Statistical estimates and transformed beta-variables. J. Wiley and Sons, New York.nGupta, S. S. 1960. Order statistics from the gamma distribution. Technometrics 2:243-262.nHabermann, H. 1973. Tolerance intervals. I. Simulation studies of non-parametric tolerance intervals. Presented at meeting of Division 5, IUFRO, South Africa.nHanson, D. L., and L. H. Koopmans. 1964. Tolerance limits for hazard rates. Ann. Math. Stat. 35:1561-1570.nHarter, H. L. 1960. Tables of range and studentized range. Ann. Math. Stat. 31:1122-1147.nJennett, W. J., and B. L. Welch. 1939. The control of proportion defective as judged by a single quality characteristic varying on a continuous scale. J. Roy. Stat. Suppl. 6:80-88.nOwen, D. B. 1962. Handbook of statistical tables. Addison-Wesley, Reading, Mass.nSiegel, S. 1956. Non-parametric statistics for the behavioral sciences. McGraw Hill, New York.nWhite, J. S. 1967. The moments of log-Weibull order statistics. General Motors Corporation, Res. Publ. GMR-717, Warren, Mich.n

Downloads

Published

2007-06-05

Issue

Number 3 / Fall 1974

Section

Research Contributions

License

The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:

1. All proprietary rights other than copyright, such as patent rights.

2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.

3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.