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Volume 17 Issue 3
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Article Navigation >  Forest Research  > 2004 >  17(3): 279-283

Citation:
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Establishment of Tree Height Growth Model Based on Mixed and Nlmixed of SAS

  • 1.

    College of Forest Resources and Environment, Beijing Forestry University, Beijing100083, China

  • 2.

    Research Institute of Forest Resource Information Techniques, CAF, Beijing100091, China

  • Received Date: 2003-06-18
  • Based on the data of height growth in 5 plots with different densities,mixed and nlmixed of SAS were used to fit the linear and non-linear mixed models of tree height growth respectively.The height growth curve and mean height growth curve under different densities were drawn according to calculated value and fixed effect value,which showed the advantages of the mixed model,i.e.it could reflect the mean variation trend on the 5 plots and the differences among individuals at the same time.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Establishment of Tree Height Growth Model Based on Mixed and Nlmixed of SAS

  • 1. College of Forest Resources and Environment, Beijing Forestry University, Beijing100083, China
  • 2. Research Institute of Forest Resource Information Techniques, CAF, Beijing100091, China
  • Received Date: 2003-06-18

Abstract: Based on the data of height growth in 5 plots with different densities,mixed and nlmixed of SAS were used to fit the linear and non-linear mixed models of tree height growth respectively.The height growth curve and mean height growth curve under different densities were drawn according to calculated value and fixed effect value,which showed the advantages of the mixed model,i.e.it could reflect the mean variation trend on the 5 plots and the differences among individuals at the same time.

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