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Forest Ecosystems
Fig. 7 | Forest Ecosystems

Fig. 7

From: Comparison of the local pivotal method and systematic sampling for national forest inventories

Fig. 7

Empirical variance ±2 Monte Carlo standard errors of mean volume estimates for simulations of systematic sampling from the 1-nn populations (horizontal bars) and the mean values of the conventional variance estimates (‘srs’; Eq. 6), the Grafström-Schelin estimates (‘vsb’; Eq. 8), and the Matérn estimates (‘matern’; Eq. 9) in the whole study region (Full) and its four subregions (see Fig. 1)

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