The sampling frame or continuum (area) from which dimensionless samples points are selected based on a statistical sampling design.

The accuracy of an estimate is the degree of closeness of the estimated mean of a variable to the actual (true) value of the population. A measure of accuracy is the bias.

predict the value of a variable of an object from values of other variables of the same object; a common example is allometric biomass models that predict biomass of an individual tree from “other met [..]

The terms “attribute” and “variable” are used interchangeably.

While “correlation” describes the statistical relationship between two variables, autocorrelation describes the statistical relationship between to observations of the same variable. In forest monitor [..]

Sum of the cross sectional areas (in 1.3 meter height) of all trees per hectare (in m2/ha).

A systematic error that prevents an accurate estimate of the true value of a variable of interest. A bias can be introduced by a biased selection of population units (selection bias), by biased estima [..]

Or: "Angle count sampling", "relascope sampling", "point sampling". An unequal probability sampling approach (or plot design). Trees are included in a sample, if they app [..]

Sample plot that is composed of unconnected sub plots. As the subplots are not selected independently, a cluster gives only one observation.

See: Nested plots.