National forest assessments (NFA) are best conducted with sufficiently accurate and scientifically defensible estimates of forest attributes. This section discusses the statistical design of the sampling plan for a forest inventory. This includes the process used to define the population to be sampled and the selection of a sample intended to satisfy the NFA precision requirements. An experienced statistician should be a member of any team designing a national forest inventory. However, if such an expert is not available, this section provides guidance and recommendations for relatively simple sample designs that reduce risk and improve chances for success.

last updated:  Wednesday, November 3, 2004