Accuracy of Double Bark Thickness Estimation Methods Used in Spruce—(Picea abies L. Karst) Timber Production in Czechia
Abstract
:1. Introduction
2. Materials and Methods
3. Results
4. Discussion
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Variable | Descriptive Statistics | ||||||
---|---|---|---|---|---|---|---|
Valid N | Mean | Median | Minimum | Maximum | Std. Dev. | Coef. Var. | |
DOB (mm) | 438 | 294.8 | 290.5 | 163.0 | 492.0 | 60.7 | 20.6 |
DUB (mm) | 438 | 280.8 | 278.2 | 155.0 | 476.0 | 59.3 | 21.1 |
DBT ED (mm) | 438 | 13.9 | 13.0 | 1.5 | 38.0 | 6.1 | 43.6 |
DBT LB (mm) | 438 | 12.1 | 12.0 | 8.6 | 17.4 | 1.6 | 13.4 |
DBT P (mm) | 438 | 11.6 | 11.5 | 8.4 | 17.2 | 1.6 | 13.7 |
DBT RD (mm) | 438 | 8.8 | 8.5 | −6.5 * | 37.5 | 6.8 | 77.9 |
DBT RD LB (mm) | 438 | 11.6 | 12 | 8 | 17 | 1.6 | 14.1 |
DBT RD P (mm) | 438 | 11.2 | 11 | 8 | 17 | 1.6 | 14.7 |
N = 438 | Regression Summary of Dependent Variable: DBT ED (mm) R = 0.28 R2 = 0.08; F(1436) = 39.715; p < 0.00000; Std. Error of Estimate: 5.8179 | |||||
---|---|---|---|---|---|---|
b* | Std. Err. of b* | b | Std. Err. of b | t(436) | p-Value | |
Intercept | 5.404130 | 1.379508 | 3.917432 | 0.000104 | ||
DOB (mm) | 0.288937 | 0.045849 | 0.028884 | 0.004583 | 6.301970 | 0.000000 |
N = 438 | Regression Summary for Dependent Variable: DBT RD (mm) R = 0.30 R2 = 0.09; F(1436) = 44.440; p < 0.00000; Std. Error of Estimate: 6.5675 | |||||
---|---|---|---|---|---|---|
b* | Std. Err. of b* | b | Std. Err. of b | t(436) | p-Value | |
Intercept | −1.11161 | 1.525205 | −0.728829 | 0.466498 | ||
DOB RD (mm) | 0.304135 | 0.045623 | 0.03434 | 0.005152 | 6.666316 | 0.000000 |
Paired-Samples t-Test Differences Are Significant on a Level of p < 0.05000 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Variables | Mean | SD | N | Difference | SD Differences | t | SV | p | CI −95.0% | CI +95% |
DBT ED (mm) | 13.919 | 6.070 | ||||||||
DBT RD (mm) | 8.838 | 6.886 | 438 | 5.081 | 2.883 | 36.87 | 438 | 0.00 | 4.810 | 5.351 |
Paired-Samples t-Test Fifferences Are Significant on a Level of p < 0.05000 | ||||||||||
Variables | Mean | SD | N | Difference | SD Differences | t | SV | p | CI −95.0% | CI +95% |
DBT ED (mm) | 13.919 | 6.070 | ||||||||
DBT LB (mm) | 12.160 | 1.633 | 438 | 1.759 | 5.812 | 6.33 | 437 | 0.00 | 1.213 | 2.304 |
DBT ED (mm) | 13.919 | 6.070 | ||||||||
DBT P (mm) | 11.672 | 1.599 | 438 | 2.247 | 5.810 | 8.09 | 437 | 0.00 | 1.701 | 2.792 |
Paired-Samples t-Test Differences Are Significant on a Level of p < 0.05000 | ||||||||||
Variables | Mean | SD | N | Difference | SD Differences | t | SV | p | CI −95.0% | CI +95% |
DBT RD (mm) | 8.838 | 6.886 | ||||||||
DBT LB RD (mm) | 12.023 | 1.640 | 438 | −3.185 | 6.575 | −10.13 | 437 | 0.000 | −3.802 | −2.567 |
DBT RD (mm) | 8.838 | 6.886 | ||||||||
DBT P RD (mm) | 11.541 | 1.597 | 438 | −2.703 | 6.578 | −8.59 | 437 | 0.00 | −3.320 | −2.085 |
Dataset | Error Metric | DBT P (mm) | DBT LB (mm) |
---|---|---|---|
DBT ED (mm) | MAE(a) | 4.835932 | 4.777381 |
MBE(b) | −2.24719 | −1.7591 | |
MAPE(c) | 46.13819 | 47.04241 | |
RMSE(d) | 6.223826 | 6.066472 | |
Dataset | Error metric | DBT P RD (mm) | DBT LB RD (mm) |
DBT RD (mm) | MAE(a) | 5.720047 | 5.89026484 |
MBE(b) | 2.702997 | 3.185274 | |
MAPE(c) | 65.19454385 | 68.8024884 | |
RMSE(d) | 7.105576 | 7.29973099 |
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Jankovský, M.; Dudáková, Z.; Allman, M.; Dvořák, J.; Peseu, P.O.; Jácome, S.P.G. Accuracy of Double Bark Thickness Estimation Methods Used in Spruce—(Picea abies L. Karst) Timber Production in Czechia. Forests 2023, 14, 1026. https://doi.org/10.3390/f14051026
Jankovský M, Dudáková Z, Allman M, Dvořák J, Peseu PO, Jácome SPG. Accuracy of Double Bark Thickness Estimation Methods Used in Spruce—(Picea abies L. Karst) Timber Production in Czechia. Forests. 2023; 14(5):1026. https://doi.org/10.3390/f14051026
Chicago/Turabian StyleJankovský, Martin, Zuzana Dudáková, Michal Allman, Jiří Dvořák, Prince Opoku Peseu, and Sandra Paola García Jácome. 2023. "Accuracy of Double Bark Thickness Estimation Methods Used in Spruce—(Picea abies L. Karst) Timber Production in Czechia" Forests 14, no. 5: 1026. https://doi.org/10.3390/f14051026
APA StyleJankovský, M., Dudáková, Z., Allman, M., Dvořák, J., Peseu, P. O., & Jácome, S. P. G. (2023). Accuracy of Double Bark Thickness Estimation Methods Used in Spruce—(Picea abies L. Karst) Timber Production in Czechia. Forests, 14(5), 1026. https://doi.org/10.3390/f14051026