Reliability of the stand regression models developed on the basis of sample plots
2011
Koprivica, M., Institute of Forestry, Belgrade (Serbia) | Matović, B., Institute of Forestry, Belgrade (Serbia)
The paper addresses the problem of reliability of the stand regression models developed on the basis of sample plots as basic sample units. The aggregate values of estimation elements, determined on sample plots are usually extrapolated per hectare before they are used for the estimation of stand elements or as variables in the construction of regression models. Other sample plot estimation values, which are not aggregate, are used in these models as individual values or as average values of the sample plots established in the stands. We tested the reliability of the models for estimating form factor, form height and volume of high beech stands in Serbia. It was concluded that the stand models obtained on the basis of a large sample of sample plots were always sufficiently reliable. When regression models used stands as basic units of the sample, instead of sample plots, the obtained models did not have a significantly greater degree of reliability.
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