Question

Data reduction using data cube aggregation

Answer 1

Data Reduction Strategies:-

1 Data Cube Aggregation

Aggregation operations are applied to the data in the construction of a data cube.

2 Dimensionality Reduction

In dimensionality reduction redundant attributes are detected and removed which reduce the data set size.

3 Data Compression

Encoding mechanisms are used to reduce the data set size.

4 Numerosity Reduction

In numerosity reduction where the data are replaced or estimated by alternative.

5 Discretisation and concept hierarchy generation

Where raw data values for attributes are replaced by ranges or higher conceptual levels.

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