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Table 4 Parameter estimates their standard errors (in parenthesis) for the taper equations used in this study

From: Estimating upper stem diameters and volume of Douglas-fir and Western hemlock trees in the Pacific northwest

Species Model b 1 b 2 b 3 b 4 b 5 b 6 b 7 b 8 b 9
Douglas-fir M1 0.02435 (0.00349) 0.85814 (0.04419) 2.57379
(0.16020)
−5.55862 (0.21594) 3.05029
(0.09678)
M2 0.79314 (0.01036) 1.02189 (0.00475) 0.99754 (0.00011) 1.10118 (0.0293) −0.18022 (0.00679) 1.19183 (0.07506) −0.61055 (0.03841) 0.15539
(0.00388)
M3 0.14030 (0.04284) 0.72960
(0.02170)
0.15440 (0.00481) −0.12140 (0.02365) 0.00124 (0.00008) 0.02678 (0.00244) −0.09579 (0.00215)
M4 1.04208 (0.00750) 0.99771 (0.00344) −0.03111 (0.00423) 0.53788 (0.00776) −1.01291 (0.01796) 0.56813 (0.00622) 4.96019 (0.12262) 0.04124 (0.00125) −0.34417 (0.01478)
M5 0.30853 (0.00476) 0.08620
(0.00295)
0.07768 (0.00184)
Western hemlock M1 0.03080 (0.01520) 0.42992 (0.19493) 4.12143 (0.71334) −7.85114 (0.96822) 4.27438 (0.43611)
M2 0.92336 (0.06729) 1.00547 (0.02555) 0.99796 (0.00053) 1.05050 (0.18665) −0.16240 (0.04297) 0.24448 (0.42759) −0.31429 (0.22831) 0.30181 (0.01235)  
M3 1.84835 (0.14518) 0.01014* (0.0756) 0.00175* (0.01611) −1.04746 (0.08274) 0.0029 (0.00033) 0.03483 (0.00922) −0.13071 (0.00935)
M4 1.05981 (0.04743) 0.99433 (0.0101) −0.01684* (0.0174) 0.64632 (0.03945) −1.56599 (0.08468) 0.74293 (0.0238) 4.75618 (0.89389) 0.0389 (0.00764) −0.19425 (0.0826)
M5 0.04561 (0.00445) −0.02362 (0.00204) − 0.86616 (0.06912)
  1. *Coefficient not significant at α = 0.05