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当地球化学数据并不服从正态分布或对数正态分布,甚至连数据转换之后也不服从正态分布时,很难用传统的方法进行统计分析。这里以一个具体的地区为例,应用了基于稳健统计学和EDA技术的地球化学异常下限确定方法,其具有简单和“稳健”的特点,也不要求数据服从任何分布。通过比较分析了基于稳健统计学和EDA技术的地球化学异常下限确定方法与传统方法的优缺点。实践表明,用该方法圈定的地球化学异常符合客观实际,异常范围大,与已知矿床(点)吻合很好。
When the geochemical data do not obey the normal distribution or the logarithmic normal distribution, even when the data conversion does not obey the normal distribution, it is hard to use the traditional method for statistical analysis. Here, taking a specific area as an example, a method of determining the lower limit of geochemical anomalies based on robust statistics and EDA techniques is applied, which has the characteristics of simplicity and “robustness” and does not require the data to be subject to any distribution. The advantages and disadvantages of the methods for determining the lower limit of geochemical anomalies based on robust statistics and EDA techniques are compared and analyzed. Practice shows that the geochemical anomaly delineated by this method is in line with the objective reality. The scope of the anomaly is large and it is in good agreement with the known deposit (point).