In which one of the following data transformations the low-level or primitive (raw) data are replaced by higher-level concepts through the use of concept hierarchies?
A. Smoothing
B. Aggregation
C. Normalization
D. Generalization
Answer:D
In which one of the following data transformations the low-level or primitive (raw) data are replaced by higher-level concepts through the use of concept hierarchies?
A. Smoothing B. Aggregation C. Normalization D. Generalization