Analysis of the diameter distribution using the RICHARDS distribution function (IV) : Fitting to the diameter distribution data of selection cutting stands and relationship between mean diameter or diameter variance and parameter m or k

Abstract

The RICHARDS distribution function was fitted to the diameter distribution data of selection cutting stands. Estimated values of parameters m and k were examined. The effectiveness was assessed because 73.8% of object stands had a standard error of estimate of less than 10%. The observed correlation coefficient between the mean diameter and parameter m was -0.2617 and that between diameter variance and parameter m was -0.2723. The mean diameter showed a high linea correlation with diameter variance and parameter k and their logarithmic values showed a higher linear correlation.