Rocky Mountain Research Station Publications
RMRS Online Publication - Journal
Articles, External Publications, and Special Reports
Composite estimation for forest inventories using multiple value groups and strata
Williams, Michael S.; Cormier, Ken A. 1996. Composite estimation for forest inventories using multiple value groups and strata. Southern Journal of Applied Forestry. 20(2): 103-109.
Due to economic and political pressures placed on timber production, information from timber inventories needs to be broken down into information on particular value groups, which are groupings based on individual tree characteristics. Thus estimates of totals and variances need to be computed for individual value groups, all value groups combined, and any collection of value groups. A method for reporting these estimates using a variance-covariance matrix is given. This is followed by two examples of the estimation of totals and variances for value groups applied to a population comprising two strata. Poisson (3P) and sample-tree sampling are used in the first and second strata, respectively. These examples are included to highlight important estimation considerations. A worked example based on an artificial population is also given. The population for the worked example is divided into two strata, with three value groups in each stratum. 3P and sample-tree sampling are used in the first and second strata.
Keywords: forest inventory, multiple value groups and strata, Poisson (3P), sample-tree sampling
About PDFs: For best results, do not open the PDF in your Web browser. Right-click on the PDF link to download the PDF file directly to your computer. Click here for more PDF help.
The PDF below was scanned and converted to text. Some errors may occur.
PDF File Size: 145 K
Title: RMRS Other
Publications: Composite estimation for forest inventories using
multiple value groups and strata
Electronic Publish Date: January 14, 2010
Last Update: January 14, 2010
RMRS Publications | Order a publication | Contact Us