1. Cut-off importance sampling of bole volume
- Author
-
Timothy G. Gregoire, Andrew P. Robinson, Harry T. Valentine, The Finnish Society of Forest Science, Suomen metsätieteellinen seura, and Finlands Forstvetenskapliga Samfund
- Subjects
0106 biological sciences ,volume ,sampling ,Offset (computer science) ,010504 meteorology & atmospheric sciences ,Mean squared error ,Ecological Modeling ,Estimator ,Forestry ,metsäninventointi ,01 natural sciences ,runko ,tilavuus ,Monte Carlo -menetelmät ,forest mensuration ,Statistics ,otantamenetelmät ,lcsh:SD1-669.5 ,stems ,Cut-off ,lcsh:Forestry ,Importance sampling ,010606 plant biology & botany ,0105 earth and related environmental sciences ,Mathematics - Abstract
Cut-off importance sampling (CIS) is introduced as a means of sampling individual trees for the purpose of estimating bole volume. The novel feature of this variant of importance sampling is the establishment on the bole of a cut-off height, He, above which sampling is precluded. An estimator of bole volume between predetermined heights Hi and Hu > Hc is proposed, and its design-based bias and mean square error are derived. In an application of CIS as the second stage of a two-stage sample to estimate aggregate bole volume, the gain in precision realized from CIS more than offset its bias when compared to the precision of importance sampling when He = HJJ.
- Published
- 1997