popvol: Population of stand-volume for 400 elements.

In biometrics: A Package for Biometrics and Modelling

Population of stand-volume for 400 elements.

Description

The data corresponds to a list of 400 elements of a population of the variable forest volume (in m^{3}/ha) measured in field plots of 0.1 ha of area. Therefore, the data emerge from a grid of 20 rows by 20 columns, completely covering a forest of 40 ha.

Usage

data(popvol)

Format

Contains two variables, as follows:

plot.id

Plot number, or ID.

vol

Stand volume, in m^{3}/ha

Source

The values were digitized from Table No. 11 of Zohrer (1980), which is actually based upon Loetsch and Haller (1964).

References

• Zohrer F. 1980. Forstinventur. Ein Leitfaden fur Studium und Praxis. Pareys Studientexte Nr. 26. Parey. Berlin, Germany. 207

• Loetsch F, Haller KE. 1964. Forest inventory. Volume 1. Bayerischer Landwirtschaftsverlag Gmbh. Munchen, Germany. 436 p.

Examples

data(popvol)
sum(popvol$vol)
mean(popvol$vol)
hist(popvol$vol)

biometrics documentation built on March 20, 2026, 5:09 p.m.