On the determination of time intervals between remeasurements of permanent plots
1993
Ranneby, B. | Rovainen, E.
In the present paper we will discuss the length of the time intervals between remeasurements of permanent sample plots. The problem is discussed within the framework of sampling with partial replacement and based on data from the Swedish National Forest Inventory (NFI). In the Swedish NFI the plots have been remeasured after 5 years. The results in the paper indicate that it is possible to extend the time interval until the next remeasurement. Furthermore, there will be a considerable gain in precision if the clear-cut plots can be treated as a separate stratum with known area. By using an approach with intuitive estimators and viewing the SPRestimator as a linear combination of these estimators it is possible to obtain additive tables with a minor loss in efficiency
显示更多 [+] 显示较少 [-]