DAV_unit-1

Discretization is the process of converting

• text to numerical data

• numerical to categorical data

• categorical to numeric data

• Categorical to text data

In which of the following method each range [a, b] is chosen in such a way that log(b) − log(a) has the same valueI

• Equi range

• Equi width range

• Equi log range

• Equi depth range

•Time-series data can be converted to discrete sequence data using an approach known as

• Singular value decomposition

• Latent Symantic Aggregation

• Pricipal Component Analysis

• symbolic aggregate approximation (SAX).

A common method for converting time series to numeric data is

• Continuous fourier transform

• Discrete wavelet transforms

• Discrete Cosine Transformation

• Discrete Fourier transform

Multidimensional scaling is a method to convert

• Graphs to numeric data

• Numeric data to graphs

• Graphs to text

• text to graphs

Process of estimating missing entries in a dataset is

• Imposition

• Commutation

• Imputation

• Computation

In which of the following method statistical behaviour of dataset is used in detecting outliers

• Domain knowledge

• Inconsistency detection

• Data Centric method

• All of the above

The different features represent different scales of reference and may therefore not be comparable to one another. Which of the following is done to overcome this?

• Imputation

• Standardization

• Deletion

• transformation

Which of the following is not a method of data reduction using axis rotation?

• Haar wavelet Transform

• Principal Component Analysis

• Latent Symantic Analysis

• Singular Value Decomposition

Which of the sampling approach works with incomplete knowledge about the previous history of the stream at any given moment in time?

• Biased Sampling

• Stratified sampling

• Reservoir sampling

• Unbiased Sampling