Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

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.

Publication Year: 2002  View PDF »

Category: Journal Articles

Abstract: Predictor sort experiments attempt to make use of the correlation between a predictor that can be measured prior to the start of an experiment and the response variable that we are investigating. Properly designed and analyzed, they can reduce necessary sample sizes, increase statistical power, and reduce the lengths of confidence intervals. However, if the non- random nature of the predictor sort is not taken into account, problems can occur. In particular, standard one-sided lower confidence bounds on quantiles of a normal distribution are overly conservative in a predictor sort situation. For lumber strength applications, this leads to 'allowable properties' that are too low. We have developed asymptotic theory that yields the correct k value in the y - ks approach to obtaining a confidence bound. The resulting confidence bounds have coverages that approach the nominal values faster than bounds based on maximum likelihood estimation. In a subsequent paper we will provide k values that are appropriate for small sample sizes.

Keywords: Tolerance bounds, asymptotics

File size: 134 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 13873
Current FPL Scientist associated with this product
Verrill, Steve P.
Mathematical Statistician
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »