Forests, Lands, and NR Operations

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Validating the site productivity layer for British Columbia with equivalence testing

Author(s) or contact(s): G.D. Nigh and J. de Jong
Source: Forests, Lands, and NR Operations
Subject: Growth and Yield
Series: Technical Report
Other details:  Published 2015. Hardcopy is available.


The site productivity layer is a database of site indexes for commercial species, which can be linked to a particular area (a site) in the province. This document reports on the validation of the site productivity layer. Equivalence testing, which tests for overall bias and 1:1 correspondence between the predicted and observed site indexes, was used to perform the validation. The equivalence test was applied to the complete layer and to strata created from the layer. As a whole, the layer was validated. However, many of the strata were not validated by the equivalence testing. Slightly more than half of the strata passed the equivalence test for unbiasedness but few strata were validated for 1:1 correspondence between the predicted and observed site indexes.

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Updated July 20, 2015