| 报告题名: | Height curves based on the bivariate Power-Normal and the bivariate Johnson’s System bounded distribution |
| 作者: | Mønness, Erik Neslein
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| 出版年: | 2013
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| 发表日期: | 2013
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| 国家: | 挪威
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| 语种: | 英语
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| 英文关键词: | height curve
; bivariate Johnson’s System bounded distribution
; bivariate power-normal distribution
; høydekurve
; bivariat Johnsons system begrenset fordeling
; bivariat potensnormal fordeling
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| 英文摘要: | English: Often, a forest stand is modeled with a diameter distribution and a height curve as somehow separate tasks. A bivariate
height and diameter distribution yield a unified model of a forest stand. The conditional median height given
the diameter is a possible height curve. Here the bivariate Johnson’s System bounded distribution and the bivariate
power-normal distribution are evaluated and compared with a simple hyperbolic height curve.
Evaluated by the deviance, the hyperbolic function yields the best height prediction. A close second is the curve
generated by the power-normal distribution. Johnson’s System bounded distribution suffers from the sigmoid shape
of the conditional median.
The bivariate power-normal is easy to estimate with good numerical properties. The bivariate power-normal is a good
candidate model concerning forest stands.##Norsk: Diametre og høyder håndteres ofte separat, men en bivariate fordeling gir en enhetlig modell for et skogbestand.
Den betingede median-høyden gitt diameter er en mulig høydekurve. Den bivariate Johnsons system B og den bivariate
potens-normale fordeling er evaluert og sammenliknet med en enkel hyperbolsk høyde-kurve.
Vurdert med roten av midlere kvadratavvik: den hyperbolske funksjonen har minst avvik. Det er naturlig da den estimeres
rett på diameter-høyde-relasjonen. Den potesnormale betingede medianen følger tett på. Johnsons system
begrenset sin betingede median er funksjonelt en S-formet kurve som gjør den mindree god, selv om den også
fungerer bra i mange tilfelle. Den bivariate potesnormale fordelingen har gode numeriske egenskaper og utgjør en
god kandidat for å estimere skogbestand. |
| URL: | https://brage.bibsys.no/xmlui/bitstream/handle/11250/134140/rapp04_2013.pdf?sequence=1&isAllowed=y
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/28444
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| rapp04_2013.pdf（321KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Mønness, Erik Neslein. Height curves based on the bivariate Power-Normal and the bivariate Johnson’s System bounded distribution. 2013-01-01.
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