摘要
本文通过实例和理论分析,认为对数变换后的数据用常规方法求得的变异系数不能充分反映元素的离散程度,并且当元素含量小于1时,还会出现负值,其意义难于理解。作者通过实例指出,用对数离差这个参数来研究元素的分布规律是可取的,并阐明了对数离差的数学意义,对数离差与变异系数及对数频率分布曲线之间的关系,最后提出了成矿概率指数和成矿相对指数的概念。
Depending on some typical examples and theoretic analyses, this paper thinks that the coefficient of variation reflect element discrete extent exactly. Moreover, negative value will occur if the element content is less than 1, and its significance is hard to understand. On the basis of typical examples, the authors point that studying element distribution regularity through logarithmic deviation is more useful. In addtion, we explain the mathematical significance of logaritmic deviation and the relationship among logarithmic deviation, coefficient of variation and frequency distribution curve. At last, the concept on mineralogenetic probability index and mine-ralogenetic relative index is presented.
出处
《物探化探计算技术》
CAS
CSCD
1990年第4期285-294,共10页
Computing Techniques For Geophysical and Geochemical Exploration
