Illustration of the Varying Coefficient Model for a Tree Growth Analysis from the Age and Space Perspectives

• Yamamura Mariko

  Hiroshima University, Japan

• Fukui Keisuke

  Hiroshima University, Japan

• Yanagihara Hirokazu

  Hiroshima University, Japan

抄録

One reason why trees grow differently over the year may be due to their relative spatial condition. In this paper, we introduce a statistical model called the varying coefficient model to estimate effects on the tree growth from the age and relative space perspectives. This model is a superior way to understand the tree growth, which is because 1) the space effects can be added in the growth curve model and visually checked by drawing contours and cubic diagrams, and 2) both the space and the age effects are estimated with their confidence interval values, and also the hypothesis test can be performed, which improve the confidence of the estimation result. The model is applied to the data of Cryptomeria japonica, the longitude and the latitude are used as the space information, and the significant spatial effect of the DBH on the stem volume was evident from the estimation result.

収録刊行物

• FORMATH

  FORMATH 15 (0), 1-9, 2016

  FORMATH研究学会

キーワード

• growth curve model
• spatial data
• tree growth
• varying coefficient model

詳細情報

• CRID: 1390001205748994560
• NII論文ID: 130005150198
• DOI: 10.15684/formath.15.001
• ISSN: 21885729
• Web Site: https://www.jstage.jst.go.jp/article/formath/15/0/15_15.001/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可