Understanding the extent and timing of forest disturbances and their impacts is critical to formulating effective management and policy responses. Broad-scale inventory programs provide key estimates of forest parameters that indicate the extent and severity of disturbance impacts. Here, we review the use of a post-stratified estimator in a panelized design, in the context of disturbance observations that are collected retrospectively. We further develop a sample weight adjustment that is requisite for proper estimation of the extent and timing of disturbances. Using populations from areas of Arkansas, California, and Maine in the US, the weight adjustment technique was tested in a Monte Carlo simulation. We found that the estimated area of disturbance using the weight adjustment technique had satisfactory agreement with the true population values and performed considerably better than the conventional post-stratified estimation approach. The proliferation of panelized forest inventory designs globally suggests that accurate estimates of areal extent and timing of disturbances will often require that weighting adjustment techniques be employed in the estimation process.
Bibliographical noteFunding Information:
Funding: Funding to support CBE in this effort was provided by the USDA Forest Service Project 15 FIA–Forest Biometrics Program Support (RJVA 15-JV-11242305-100). J.W.C., J.A.W., and M.E.T. received no external funding in support of this research.
- Forest inventory and analysis
- Post-stratified estimation
- Sample weights
- Unequal probability