利用循环交叉验证法确定变异函数

Determination of Variogram by Cycled Cross Validation

在进行泛克里金估值时,确定漂移的形式及剩余的变异函数是一个关键的问题。本文分析了确定剩余的变异函数和漂移开式的交叉验证法和迭代法的优缺点,指出了将这两种方法的有机的结合起来会获得取长补短的效果,同时提出了循环交叉验证的方法,以加快交叉验证的速度,提高检验精度,并利用油田实际数据进行了应用的研究。

Determining the expression of drift and the variogram of residuals is the crux of Kriging valuation, and it is of great importance to analyse the spatial distribution characteristics of the regionalized variables. In this paper, the advantages and disadvantages associated with the cross validation method and the iterative method for determining the expression of drift and the variogram of residuals are discussed. It points out that an organic combination of the two methods will gain the effect of keeping the strong points and making up deficiencies. In order to speed up the cross validation and mprove the accuracy of check, cycled cross validation method is proposed. Application studies have been made by using the data from the oilfields.