• Title/Summary/Keyword: evaluation ststistic

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Local Correction of Tree Volume Equation for Larix leptolepis by Ratio-of-Means Estimator (평균비(平均比) 추정량(推定量)에 의한 낙엽송(落葉松) 입목(立木) 재적식(材積式)의 지역(地域) 보정(補正))

  • Shin, Man Yong;Yun, Jong Wha;Cha, Du Song
    • Journal of Korean Society of Forest Science
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    • v.85 no.1
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    • pp.56-65
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    • 1996
  • Current volume tables might underestimate or overestimate the volumes of individual trees in a specific region because the tables were made using the data from broad region. This study provides a statistical method of local correction, which is the ratio-of-means estimator, when the table is applied to the data from a specific region. Data used in this study were 411 trees of Larix leptolepis from Hongchon region. Five statistical models for individual tree volume equation were evaluated based on 3 evalation criteria and the best equation fitted to the data from Hongchon region was selected. The volume estimated by the selected equation was then compared with the volume estimated by the current volume table. From the ratio-of-means estimate based on the volumes estimated by selected equation and by current volume table, the local correction was made. The correction equation was $V_{Hongchon}=1.078$ $V_{volume\;table}$. It is also proved that the correction equation can simply and precisely estimate tree volumes of Larix leptolepis in Hongchon region using the current volume table.

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