Abstract

The volume of teak trees (Tectona grandis Linn. f.) was analyzed using data from a teak plantation managed by the research and development team at Sabah Softwood Berhad in Brumas Camp, Tawau, Sabah, Malaysia. To fit the exponential model to the experimental variogram, various bin widths were used to obtain different variogram models. These models were plotted for comparison, and the root mean square error (RMSE) was calculated. Additionally, cross-validation was performed to assess the predictive accuracy of each model for the unseen data. The analysis indicated that a bin width of 0.003—that was approximately 333 m apart—was ideal for fitting the exponential model. This width demonstrated the lowest RMSE and ideal graphical observations. This study confirms that selecting the optimal bin width significantly affects the accuracy of model predictions, regardless of the sample size.

Details

Title
Effect of bin width on variogram model accuracy: a case study of teak tree volume specific to Solomon clone in Tawau, Sabah, Malaysia
Author
Kiram, Johannah Jamalul 1 ; Rossita Mohamad Yunus 2 ; Japarudin, Yani 3 ; Lapammu, Mahadir 3 ; Monteuuis, Olivier 4 ; Doreen Kim Soh Goh 5 

 Preparatory Centre for Science and Technology, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah, Malaysia; Institute of Mathematical Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia 
 Institute of Mathematical Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia 
 Sabah Softwood Berhad, Tawau, Sabah, Malaysia 
 CIRAD-BIOS Department – UMR AGAP, TA A-108/03, Avenue Agropolis, F-34398Montpellier, Cedex 5 France 
 YSG Biotech Sdn Bhd, Yayasan Sabah Group, Voluntary Association Complex, Mile 2½, off Tuaran Road, Kota Kinabalu, Sabah, Malaysia 
Pages
215-220
Publication year
2025
Publication date
Jun 2025
Publisher
Taylor & Francis Ltd.
ISSN
21580103
e-ISSN
21580715
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3219162325
Copyright
© 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This work is licensed under the Creative Commons  Attribution – Non-Commercial License http://creativecommons.org/licenses/by-nc/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.