变异系数用于标本磁参数统计工作的研究

Study on Usage of Coefficient of Variation for Statistics of Magnetic Parameters of Samples

过去,人们对岩(矿)石磁参数测定工作不够重视,多数磁测工作是按照相应的工作规范只是测一测岩(矿)石磁参数。甚至有不少磁测工作不对工区内的岩(矿)石标本做磁参数测定工作,或只做少量的测定工作。而这些为数不多的磁参数测定工作也只是作磁化率和剩余磁化强度的平均数(众数)统计,没有对标本磁参数离散程度进行深入的统计研究。尽管利用变异系数表征磁参数的相对离散程度是很早就被人们认识到的。但是,目前就是在极少数关注磁参数离散程度的研究者中,也多引用标准离差,而不是变异系数。笔者对岩(矿)石标本磁参数的变异系数作了浅显的研究,并认为研究岩石磁性强度的自身不均匀性和相互之间的不均匀性对比,变异系数应当是一个不错的参数。

In the past, the work on rock （ore） magnetic parameter measurement was not pay enough attention and most of work only measured magnetic parameter, sometimes seldom or even no measuring was done. Some of the work only statistically study the mean of magnetic susceptibility and magnetism, residual magnitude, not deeply study the sample dispersion of magnetic parameter. Although it is known that Coefficient of variation can express the relative dispersion, but few researchers study on the coefficient of variation, and most of time, they use the standard deviation. The author studies the Coefficient of variation of the magnetic parameter on the rock samples, from the contrast with the self - uniformity and inter - uniformity, and finally get the conclusion that coefficient of variation is a suitable coefficient.