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Summary
Estimates of pulpwood volumes exported from Australia and New Zealand are generally based on stratified samples of logs. This study investigates the possibility of modifying the existing sampling technique to cover consignments of logs only partly segregated on log size. A data set of 10 export consignments consisting of 193 truckloads containing 12150 logs was used to compare 100% scale, 10% stratified sampling, and a revised system involving 10% sampling of logs below a small-end diameter limit of 26 cm and complete scaling of logs above that limit. Compared with 10% stratified sampling, the revised system reduced the average bias for a typical consignment of pulpwood and improved the precision, with the 95% confidence interval of mean log volume being reduced from 7.9% to 3.9% of the mean.