Height curves based on the bivariate Power-Normal and the bivariate Johnson&rsquo;s System bounded distribution

GSTDTAP > 气候变化

	Height curves based on the bivariate Power-Normal and the bivariate Johnson’s System bounded distribution
	Mønness, Erik Neslein
	2013
出版年	2013
语种	英语
国家	挪威
领域	气候变化
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.
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
URL	查看原文
来源平台	Center for International Climate and Environmental Research-Oslo (CICERO)
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/1836
专题	气候变化
推荐引用方式 GB/T 7714	Mønness, Erik Neslein. Height curves based on the bivariate Power-Normal and the bivariate Johnson’s System bounded distribution,2013.