@article{RN703,
   author = {Ranneby, Bo and Rovainen, Eva},
   title = {On the determination of time intervals between remeasurements of permanent plots},
   journal = {Forest Ecology and Management},
   volume = {71},
   number = {3},
   pages = {195-202},
   abstract = {Remeasurement frequency in permanent sample plots is discussed within the framework of sampling with partial replacement (SPR) and based on data from the Swedish National Forest Inventory (NFI). Previously, Swedish NFI plots were measured every 5 years. The results indicate that it is possible to extend the time interval until the next remeasurement. An extension from 5 to 10 years increases variance by 5–13%, depending on the temporal correlation. By treating the clear-cut plots as a separate stratum with known area, there is a considerable gain in precision. With such a stratum and a measurement interval of 10 years, the variance decreases by 15–20%. By using an approach with intuitive estimators, and viewing the SPR estimator as a linear combination of these, it is possible to obtain additive tables with only minor loss in efficiency.},
   keywords = {Sampling with partial replacement
Permanent plot
Additivity of estimates},
   ISSN = {0378-1127},
   DOI = {10.1016/0378-1127(94)06099-5},
   year = {1995},
   type = {Journal Article}
}

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