Construction of Volume Tables Through Statistical Modelling of Chir Pine Trees of Jammu Region
Loading...
Date
2022-01
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
A research study entitled “Construction of Volume Tables Through Statistical Modelling of Chir Pine Trees of Jammu Region ” was conducted on secondary data of Chir Pine trees of Jammu province on variables like height, diameter and volume across various forest circles from forest department of UT of J&K and consequently the data was fitted on various statistical models. The aim of this study was to construct one way and two way volume tables for Chir Pine trees of Jammu province. In order to access the performance of the fitted models across the forest circles various selection criteria’s like RSE, RMSE, MAE, AIC, BIC, R2, Adj. R2 were used in this study, like wise Shapiro wilk test was used to test normality of error distribution across various models. With the help of various libraries of R studio (version : 4.0.2, 2020) models were further cross validated in a ratio of 70:30, where 70 percent of observations were randomly used for calibration and remaining 30 percent for validation with a view to access the predictive ability of the fitted models. On the basis of prediction error rates, D5 and HD6 models turned out to be best fitted models under cross validation and accounted for the greatest proportion of total volume variationsin comparison to its counter parts used in this study. Accordingly, both these models were used for construction of one way and two way volume tables of Chir Pine trees across three forest circles of Jammu province utilizing variables like diameter and height.
Description
Keywords
Citation
Preferred for your work. Raina N. 2022. “Construction of Volume Tables Through Statistical Modelling of Chir Pine Trees of Jammu Region” M.Sc. Thesis, SKUAST Jammu.