Sampling And Statistics

About sampling forest data

Estimations from plot sample data

Assume we have sampled n plots from a treatment unit (stand) with area A and that we want to estimate some stand variable Y, given as a value per area unit Ysub(ha). Then the estimated value of Y is

$\hat{Y}_{ha}} = \frac{\sum_{i=1}^n{y_i}}{\sum_{i=1}^n{a_i}}$

where
$y_i=$ estimated value in plot i, and
$a_i=$ inventoried area of plot i

To get the total value for the stand, we simply multiply with A (assuming that A is known):
$\hat{Y}_{tot}} = A\times\hat{Y}$

Sampling And Statistics

About sampling forest data

Estimations from plot sample data

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