D. C. Chaudhari , S. K. Sheel , D. N. Uniyal , R. S. Bisht

Abstract

The results of experiments in the retapping by Rill method of the healed up channels in Chir pine already tapped by Cup and lip method, carried out at New Forest, Dehra Dun have revealed that the resin yield was 4.45 kg/blaze which is viabJe from economic point of view. Therefore, the resin production may be supplemented by retapping healed up channels of abandoned pine trees if such trees are available in pine growing states.

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Rajesh Kumar , S. K. Sheel , T. C. Pokhriyal

Abstract

The moisture content in green plants is a highly variable character over the seasons. The seasonality of moisture content can be studied applying the technique of time-series analysis. In the present study an attempt has been made to analyse the moisture content behaviour statistically in different plant parts of Acacia and Eucalyplus grown under potculture conditions.

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S. K. Sheel , K. M. Kukreti , A. K. Chaubey

Abstract

Most of the problems in economics are concerned with the study of relationships between economic variables Such a relationship in the form of a mathematical equation is generally used for prediction purposes Hence the specification of an appropriate functional form for a particular situation is of utmost significance. The functional form under a class of linear models may be linear, quadratic, logarithmic, hyperbolic or may be of a mixed nature. It is quite vexing to decide which functional form is most suitable to the situation under study. Here an attempt has been made to illustrate with an example as how the use of Furnival Index can be helpful to arrive at the most appropriate functional form. This may be useful in the study of forest economics problems.

Keywords

Coeff. Of multiple correlation, Furnival Index, Simple correlation coeff

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A. K. Chaubey , K. P. Unnikrishnan , S. K. Sheel

Abstract

When the independent variates in a regression model exhibit perfect or high degree of dependence among themselves, the method of least squares fails to provide satisfactory estimates of regression coefficients. The variables are then said to be collinear and the phenomena is termed multicollinearity. In studies pertaining to socio-economic conditions this phenomena is most likely to occur. We are, therefore, not concerned whether or not multicollinearity exists in our data in such situations but upto what degree it exists and affects our estimates, and how the problem can be dealt with, since the presence of severe multicollinearity badly affects the least square estimators and makes them imprecise. Though there are many methods to overcome this problem, we have in our study emphasized the use of Principal Component Analysis as the most suitable method.

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A. K. Chaubey , S. K. Sheel , K. P. Unnikrishnan

Abstract

The use of Partially Balanced Incomplete Block Designs (PBIBD) in timber engineering experiments has been described. The experiments are aimed at estimating the average safe load taken by timber 'joints and comparison of different types of connect dry used in making joints. It has been shown that when the experimental material is not' available in sufficient quantities or its cost is too prohibitive, PBIB designs are more appropriate than Randomised block designs.

Keywords

Incomplete Block Designs, Balancing of the Designs

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