Evaluation of mapped-plot variance estimators across a range of partial nonresponse in a post-stratified national forest inventory

When conducting a forest inventory, sometimes portions of plots cannot be measured due to inaccessibility. Two primary methods have been presented account for partial nonresponse in the estimation phase: (i) use ratio-to-size estimator or (ii) apply an adjustment factor all plot observations proportion missing area. Both approaches provide identical estimates population mean, but variance differ when is present. The performance estimators was examined range area and proportions sample. performed unbiasedly with respect simulation results, were biased, magnitude direction dependent upon amount nonresponse. bias relatively small small, which often case; however, method preferred ensure accurate wide circumstances.