Fig. 3From: Comparison of estimators of variance for forest inventories with systematic sampling - results from artificial populationsSample-based maximum likelihood estimates of the autocorrelation functions (acf) in a fractional Gaussian noise process (cf. (7)). The examples are from the populations in Fig. 2. The horizontal axis is the lag in units and the vertical axis is the autocorrelation. One acf is drawn for each possible sample under a given designBack to article page