Estimation procedures for the combined 1990s periodic forest inventories of California, Oregon, and Washington.

Abstract

During the 1990s, forest inventories for California, Oregon, and Washington were conducted by different agencies using different methods. The Pacific Northwest Research Station Forest Inventory and Analysis program recently integrated these inventories into a single database. This document briefly describes potential statistical methods for estimating population totals, means, and associated sampling errors for these inventories. Differences in estimates using past methods for periodic inventories compared to estimates from proposed methods for a new annual inventory system were generally minor. This document is intended to be a resource for researchers using the 1990s forest inventory data for these states; examples are included to illustrate issues.

Citation

Barrett, T.M. 2004. Estimation procedures for the combined 1990s periodic forest inventories of California, Oregon, and Washington. Gen. Tech. Rep. PNW-GTR-597. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 19 p