The Effect of Histogram Class Interval on the Calculation of Mean Fibre Curvature and Standard Deviation of Fibre Curvature

Abstract

Two wool samples with different Mean Fibre Curvature (MFC) were measured on OFDA. The Fibre Curvature data was captured and used to calculate frequency histograms. Data were grouped into bins encompassing class intervals of 1, 10, 20, 40, 80 and 120 deg/mm. Distribution statistics were calculated using the normal procedures for grouped data.

These show the effect of different class intervals of the frequency distribution histogram on the Mean Fibre Curvature (MFC) and the Standard Deviation of Fibre Curvature (SDFC).

There is very little impact on the MFC and SDFC between class intervals between 1 to 40 deg/mm in size. However, results have also shown a small impact on the MFC and SDFC at 120 deg/mm due to the asymmetrical nature of the FC distribution.

Citation

"The Effect of Histogram Class Interval on the Calculation of Mean Fibre Curvature and Standard Deviation of Fibre Curvature", V.E. Fish, Raw Wool Group, Report 05, IWTO Barcelona Meeting, May 2002