Fig. 1From: Simple random sampling of individual items in the absence of a sampling frame that lists the individualsLocations of individual trees in artificially constructed forest populations contained in 700-m square areas. In a, there were 720 individuals, with 360 trees of smaller stem diameters (open circle) arranged in circular groups whilst 360 larger diameter trees (filled circle) were scattered randomly. In b, 676 individuals were arranged on a 26.05-m square gridBack to article page