Quadratic mean diameter
id:
quadratic-mean-diameter-255-14436977
title:
Quadratic mean diameter
text:
In forestry, quadratic mean diameter or QMD is a measure of central tendency which is considered more appropriate than arithmetic mean for characterizing the group of trees which have been measured. For n trees, QMD is calculated using the quadratic mean formula: ∑ D i 2 n where D i is the diameter at breast height of the ith tree. Compared to the arithmetic mean, QMD assigns greater weight to larger trees – QMD is always greater than or equal to arithmetic mean for a given set of trees. QMD can
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wiki
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encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Quadratic_mean_diameter
date created:
date modified:
2022-09-14T09:58:13Z
main entity:
{"identifier":"Q7268363","url":"https://www.wikidata.org/entity/Q7268363"}
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13
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