FOREST RESOURCES WANAGEMENT ›› 2020, Vol. 0 ›› Issue (1): 151-157.doi: 10.13466/j.cnki.lyzygl.2020.01.019
• Technical Application • Previous Articles Next Articles
Lihua FU1, Jinchao HOU1, He SUN2, Hezhi WANG3, Qiang LIU4, Shun CHENG1()
Received:
2019-11-25
Revised:
2019-12-16
Online:
2020-02-28
Published:
2020-05-18
Contact:
Shun CHENG
E-mail:chshaaaa@163.com
CLC Number:
Lihua FU, Jinchao HOU, He SUN, Hezhi WANG, Qiang LIU, Shun CHENG. Stem Shape Curves Simulation for Larixprincipis-rupprechtii Using Quantile Regressions[J]. FOREST RESOURCES WANAGEMENT, 2020, 0(1): 151-157.
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URL: http://www.lyzygl.com.cn/EN/10.13466/j.cnki.lyzygl.2020.01.019
Tab.3
Results of the estimations of parameters and goodness-of-fitting
模型 | 参数 | 估计值 | 置信区间95% | P 值 | 决定系数 ( | 均方根误差 (RMSE/cm) | |
---|---|---|---|---|---|---|---|
M1 | a1 | 1.7565(0.0921) | 1.5677 | 1.9254 | <0.001 | 0.888 | 5.080 |
a2 | 0.8658(0.0198) | 0.8269 | 0.9045 | <0.023 | |||
a3 | 0.7929(0.0077) | 0.7778 | 0.0808 | <0.001 | |||
a4 | -0.7926(0.0242) | -0.8402 | -0.7451 | 0.028 | |||
M2 | b1 | 1.5607(0.0125) | 1.5362 | 1.5853 | <0.001 | 0.934 | 1.985 |
b2 | -3.2744(0.0663) | -3.4045 | -3.1444 | <0.001 | |||
b3 | 1.8807(0.0725) | 1.7384 | 2.0229 | <0.001 | |||
M3 | c1 | 1.3738(0.0216) | 1.3313 | 1.4162 | 0.047 | 0.893 | 2.319 |
c2 | 1.3039(0.0201) | 1.2645 | 1.3434 | 0.031 | |||
M4 | d1 | 0.0774(0.0009) | 0.0754 | 0.0793 | <0.001 | 0.905 | 2.417 |
Tab.5
Parameter estimations of the quantile regressionand the results of fitting and validation
分位点 | 参数 | 估计值 | P 值 | 决定系数(R2) | 均方根误差(RMSE/cm) |
---|---|---|---|---|---|
无 | b1 | 1.5572(0.0106) | <0.001 | 0.901 | 1.970 |
b2 | -3.2725(0.0560) | <0.001 | |||
b3 | 1.8855(0.0615) | <0.001 | |||
τ=0.1 | b1 | 1.0717(0.0130) | <0.001 | 0.832 | 2.336 |
b2 | -1.7107(0.0599) | <0.001 | |||
b3 | 0.6063(0.0538) | <0.001 | |||
τ=0.2 | b1 | 1.1344(0.0132) | <0.001 | 0.871 | 2.063 |
b2 | -1.8030(0.0525) | <0.001 | |||
b3 | 0.6380(0.0446) | <0.001 | |||
τ=0.3 | b1 | 1.1959(0.0170) | <0.001 | 0.898 | 1.866 |
b2 | -1.9254(0.0654) | <0.001 | |||
b3 | 0.7092(0.0541) | <0.001 | |||
τ=0.4 | b1 | 1.2745(0.0258) | <0.001 | 0.918 | 1.712 |
b2 | -2.1056(0.0892) | <0.001 | |||
b3 | 0.8218(0.0698) | <0.001 | |||
τ=0.5 | b1 | 1.3887(0.0225) | <0.001 | 0.929 | 1.632 |
b2 | -2.4285(0.0832) | <0.001 | |||
b3 | 1.0596(0.0709) | <0.001 | |||
τ=0.6 | b1 | 1.4966(0.0279) | <0.001 | 0.925 | 1.722 |
b2 | -2.7285(0.0966) | <0.001 | |||
b3 | 1.2874(0.0812) | <0.001 | |||
τ=0.7 | b1 | 1.5870(0.0175) | <0.001 | 0.910 | 1.930 |
b2 | -2.9328(0.0661) | <0.001 | |||
b3 | 1.4300(0.0654) | <0.001 | |||
τ=0.8 | b1 | 1.7031(0.0270) | <0.001 | 0.879 | 2.301 |
b2 | -3.2287(0.0996) | <0.001 | |||
b3 | 1.6572(0.0951) | <0.001 | |||
τ=0.9 | b1 | 1.8189(0.0341) | <0.001 | 0.690 | 3.526 |
b2 | -4.0681(0.1228) | <0.001 | |||
b3 | 2.7712(0.1265) | <0.001 |
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