YARN CO-EFFICIENT OF VARIATION PERCENTAGE::
The variation in yarn count from one skein ( Lea) to the other skein can be measured by the co-efficient of variation ( C.V.) which is merely the standard deviation ( SD) expressed as a percentage of the average. It is a very important calculation in the spinning process. This calculation is always useful to control the linear density of material like sliver to final yarn. The C.V. % of output material is regularly calculated to control the yarn count variation. The C.V.% of yarn tensile strength and RKM. is also calculated to control the yarn quality. The method of calculation of the co-efficient of variation is given below:
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