Informatics Publishing Limited

P. K. Mahajan , S. P. Dhall

Abstract

This study highlights the fact that the trends in the area under forest are not regular though the increase in the forest area in Himachal Pradesh was observed to be about 77 percent over the 17 years period ranging from 1979-80 to 1995-96. Almost perfect positive correlation is noted between change in 'total forest area' and 'protected forest area' when the effects of the variables such as 'reserved forest area', 'unclassified forest area', 'forest area not under the control of Forest Department' have been eliminated.

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Rajiv Pandey , S. P. Dhall

Abstract

By application of Jackknifing technique, a tool for bias reduction, an equation Ln V = • 2.8554 + 1.4265 Ln dh, where V, dh are volume, dbh and height respectively is obtained for volume prediction of Poplar tree.

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Rajiv Pandey , S. P. Dhall , R. Malhotra

Abstract

A new modified error index is proposed , which can be used together with adj R² as a tool for the selection and assessment of model.

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Rajiv Pandey , S. P. Dhall , B. S. Kanwar , S. D. Bhardwaj

Abstract

Cross-validation technique is discussed for the validation purpose of models with brief review of the technique in forestry literature. Results of two volume estimation models have been analysed with definition of few terms viz.. apparent error. true error and excess error.

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Rajiv Pandey , S. P. Dhall , Rakesh Kumar

Abstract

Cross-validation technique is discussed for the validation purpose of models. Results of apparent error, true error, excess error and other statistics of two volume estimation models of Poplar have reported.

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