DSBDA Quiz

Which of the following are NOT data reduction techniques ?

• Data cube aggregation

• Numerosity reduction

• Attribute subset selection

• Decimal scaling

__________ Normalization performs a linear transformation on the original data.

• Z-score

• Min-max

• Smoothing

• Aggregation

Which of the following methods to perform dimension reduction ?

• Missing values

• Decision tree

• Random forest

• All of these

______________ is usually performed as an iterative two-step process consisting of discrepancy detection and data transformation.

• Data reduction

• Data integration

• Data cleaning

• Data transformation

A _____________ measure is a measure that must be computed on the entire data set as a whole.

• distributive

• holistic

• unimodal

• bimodal

KDD stands for________________.

• Knowledge Database in Discovery

• Known Discovery in Databases

• Known Distributed Databases

• Knowledge Discovery in Databases

Which of the following is NOT data preprocessing techniques ?

• Data cleaning

• Data integration

• Data Handling

• Data transformation

Concept hierarchies are a form of data smoothing. that can also be used for data

• binarization

• discretization

• missing

• all of these

Strategies for data reduction include

• Attribute subset selection

• Numerosity reduction

• Data cube aggregation

• All of these

The __________ of a data set is the average of all the data values.

• Mean

• Median

• Mode

• All of these