Question

(1) If a record data matrix has reduced number of columns after a transformation, the transformation has performed:

A. Data sampling
B. Dimensionality reduction
C. Noise cleaning
D. Discretization



(2) If a record data matrix has reduced number of rows after a transformation, the transformation has performed:

A. Data sampling
B. Dimensionality reduction
C. Noise cleaning
D. Discretization​

Answer 1

Answer:

1.  ans= B. Dimensionality reduction

2.  ans=A. Data Sampling

Explanation:

I don't think it needs explanation because these are simply definitions.

Answer 2

(1) If a record data matrix has reduced the number of columns after a transformation then the transformation that has been performed is :

B.) Dimensionality reduction

• It can be defined as the process of reducing the number of random variables by obtaining a set of principal variables.

(2) If a record data matrix has reduced the number of rows after a transformation then the transformation that has been performed is :

A.) Data sampling

• It can be defined as a statistical analysis technique used to select, manipulate and analyze a representative subset of data points