翻訳と辞書 Words near each other ・ Quadrophenia Live in London ・ Quadrophonia ・ Quadropus ・ Quadrula ・ Quadrula metanevra ・ Quadrula pustulosa ・ Quadrula quadrula ・ Quadrula refulgens ・ Quadrula rumphiana ・ Quadrula tuberosa ・ Quadrumana ・ Quadratic integrate and fire ・ Quadratic irrational ・ Quadratic Jordan algebra ・ Quadratic Lie algebra ・ Quadratic mean diameter ・ Quadratic pair ・ Quadratic probing ・ Quadratic programming ・ Quadratic reciprocity ・ Quadratic residue ・ Quadratic residue code ・ Quadratic residuosity problem ・ Quadratic set ・ Quadratic sieve ・ Quadratic transformation ・ Quadratic unconstrained binary optimization ・ Quadratic variation ・ Quadratic-linear algebra ・ Quadratically closed field Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Quadratic mean diameter ： ウィキペディア英語版 Quadratic mean diameter 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 as: $\backslash sqrt\; \}\}$ where $$ 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 be used in timber cruises to estimate the standing volume of timber in a forest, because it has the practical advantage of being directly related to Basal area, which in turn is directly related to volume. QMD can also be calculated as: $\backslash sqrt\; \}$ where BA is stand basal area, n is the number of trees, and k is a constant based on measurement units - for BA in ft2 and DBH in inches, k=0.005454; for BA in m2 and DBH in cm, k=0.0000785. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quadratic mean diameter」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.