Comprehensive Evaluation of Offshore Oilfield Development Plans Based on Grey Clustering Analysis with Cloud Model

Algorithm 4

The normalization method.

For the first class, in which the indexes of higher values are better (), the data cloud be normalized by

;

For the second class, in which the indexes of lower values are better (), the data cloud be normalized by

 ;

For the second class, in which the indexes of moderate values are better (), the data cloud be normalized by