Dimensionality Reduction Techniques in Data Mining Quiz
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Questions and Answers

What is another term for attribute in the context of data mining?

  • Indicator
  • Variable (correct)
  • Parameter
  • Constant

    • In data mining, what is a collection of attributes that describe an object known as?

  • Node
  • Record (correct)
  • Element
  • Factor

    • What are attribute values in data mining?

  • Probabilities assigned to an attribute
  • Categories assigned to an attribute
  • Numbers or symbols assigned to an attribute (correct)
  • Weights assigned to an attribute

    • What is the distinction between attributes and attribute values in data mining?

    <p>Same attribute can be mapped to different attribute values</p> Signup and view all the answers

    In data mining, what is an example of different attributes being mapped to the same set of values?

    <p>Attribute values for ID and age being integers</p> Signup and view all the answers

    What is the term used in data mining for the way an attribute is measured not matching the attribute's properties?

    <p>Measurement discrepancy</p> Signup and view all the answers

    What is another term for object in the context of data mining?

    <p>Entity</p> Signup and view all the answers

    In data mining, what is a property or characteristic of an object known as?

    <p>Attribute</p> Signup and view all the answers

    Which type of attribute captures only the order properties of length?

    <p>Ordinal</p> Signup and view all the answers

    What type of attribute preserves both order and additivity properties of length?

    <p>Ratio</p> Signup and view all the answers

    Which attribute type encompasses the notion of 'good, better, best'?

    <p>Ordinal</p> Signup and view all the answers

    What type of attribute has real numbers as attribute values?

    <p>Interval</p> Signup and view all the answers

    Which attribute type can be described in terms of transformations that do not change the meaning of the attribute?

    <p>Ratio</p> Signup and view all the answers

    What type of attribute has only a finite or countably infinite set of values?

    <p>Nominal</p> Signup and view all the answers

    Which type of attribute is represented as floating-point variables?

    <p>Interval</p> Signup and view all the answers

    What type of attribute is regarded as important only in its presence (non-zero attribute value)?

    <p>Nominal</p> Signup and view all the answers

    Which type of attribute involves operations like addition and multiplication?

    <p>Ratio</p> Signup and view all the answers

    What type of attribute transformation involves any permutation of values?

    <p>Nominal</p> Signup and view all the answers

    Which type of attribute involves an order-preserving change of values?

    <p>Ordinal</p> Signup and view all the answers

    What type of attribute is a special case of discrete attributes and often represented as integer variables?

    <p>Nominal</p> Signup and view all the answers

    What is the purpose of aggregation in data preprocessing?

    <p>Data reduction</p> Signup and view all the answers

    Which type of sampling allows the same object to be picked up more than once?

    <p>Sampling with replacement</p> Signup and view all the answers

    What is the key principle for effective sampling?

    <p>Using a sample that is representative of the original data</p> Signup and view all the answers

    What is the purpose of dimensionality reduction in data mining?

    <p>Avoid curse of dimensionality</p> Signup and view all the answers

    Which technique is used for dimensionality reduction and aims to capture the maximum amount of variation in the data?

    <p>Principal Component Analysis (PCA)</p> Signup and view all the answers

    What issue arises when merging data from heterogeneous sources?

    <p>Duplicate data</p> Signup and view all the answers

    What is the purpose of data cleaning in data preprocessing?

    <p>Dealing with duplicate data issues</p> Signup and view all the answers

    What does the curse of dimensionality refer to?

    <p>Data becoming increasingly sparse as dimensionality increases</p> Signup and view all the answers

    What is the main purpose of sampling in data mining?

    <p>To make data analysis less expensive or time consuming</p> Signup and view all the answers

    What is the purpose of attribute transformation in data preprocessing?

    <p>To convert attributes into a more suitable format for analysis</p> Signup and view all the answers

    Which type of sampling ensures an equal probability of selecting any particular item?

    <p>Simple random sampling</p> Signup and view all the answers

    What does aggregation aim to achieve in data preprocessing?

    <p>Reducing the number of attributes or objects</p> Signup and view all the answers

    What are some important characteristics of data according to the text?

    <p>Dimensionality, sparsity, resolution, and size</p> Signup and view all the answers

    What type of data involves a set of items in each record?

    <p>Transaction data</p> Signup and view all the answers

    What does noise refer to in the context of data quality problems?

    <p>Modification of original values</p> Signup and view all the answers

    Which type of data represents data objects as points in a multi-dimensional space?

    <p>Data matrix</p> Signup and view all the answers

    What type of data includes sequences of transactions, genomic sequence data, and spatio-temporal data?

    <p>Ordered data</p> Signup and view all the answers

    What is an example of graph data according to the text?

    <p>Molecules</p> Signup and view all the answers

    What type of data quality problem refers to considerably different data objects?

    <p>Outliers</p> Signup and view all the answers

    What type of data consists of a collection of records with fixed attributes?

    <p>Record data</p> Signup and view all the answers

    What type of data is represented as term vectors with term frequency values?

    <p>Document data</p> Signup and view all the answers

    What type of data involves a modification of original values in the context of data quality problems?

    <p>Noise</p> Signup and view all the answers

    Which type of data quality problem can be handled by elimination or estimation?

    <p>Missing values</p> Signup and view all the answers

    What type of data involves generic graphs, molecules, and webpages?

    <p>Graph data</p> Signup and view all the answers

    Which technique aims to reduce redundant and irrelevant features in the dataset?

    <p>Feature subset selection</p> Signup and view all the answers

    What does feature creation involve?

    <p>Creating new attributes that capture important information more efficiently</p> Signup and view all the answers

    Which technique involves mapping data to a new space through Fourier transform and wavelet transform?

    <p>Mapping data to a new space</p> Signup and view all the answers

    What does discretization involve?

    <p>Converting continuous attributes into ordinal attributes</p> Signup and view all the answers

    Which method is commonly used in classification and involves unsupervised and supervised approaches?

    <p>Discretization</p> Signup and view all the answers

    What does binarization involve?

    <p>Mapping continuous or categorical attributes into one or more binary variables</p> Signup and view all the answers

    What does attribute transformation involve?

    <p>Mapping the entire set of values of an attribute to a new set of replacement values</p> Signup and view all the answers

    What is normalization?

    <p>A type of attribute transformation that adjusts differences among attributes</p> Signup and view all the answers

    What is the goal of attribute transformation?

    <p>To remove unwanted, common signals and adjust for differences among attributes</p> Signup and view all the answers

    What are dimensionality reduction techniques crucial for?

    <p>Improving the efficiency and effectiveness of data mining tasks</p> Signup and view all the answers

    What is the Iris Plant data set used for?

    <p>To illustrate discretization</p> Signup and view all the answers

    Which discretization methods include equal interval width, equal frequency, and K-means approaches?

    <p>Unsupervised and supervised approaches</p> Signup and view all the answers

    Study Notes

    Introduction to Data Mining: Dimensionality Reduction Techniques

    • Dimensionality reduction includes techniques such as feature subset selection, feature creation, and attribute transformation.
    • Feature subset selection aims to reduce redundant and irrelevant features in the dataset.
    • Feature creation involves creating new attributes that capture important information more efficiently than the original attributes.
    • Mapping data to a new space can be achieved through techniques like Fourier transform and wavelet transform.
    • Discretization involves converting continuous attributes into ordinal attributes, commonly used in classification.
    • The Iris Plant data set, obtained from the UCI Machine Learning Repository, is used as an example to illustrate discretization.
    • Discretization methods include unsupervised and supervised approaches, as well as equal interval width, equal frequency, and K-means approaches.
    • Binarization maps continuous or categorical attributes into one or more binary variables, often used for association analysis.
    • Attribute transformation involves mapping the entire set of values of an attribute to a new set of replacement values using functions such as xk, log(x), ex, and |x|.
    • Normalization is a type of attribute transformation that adjusts differences among attributes in terms of frequency of occurrence, mean, variance, and range.
    • The goal of attribute transformation is to remove unwanted, common signals and adjust for differences among attributes.
    • These dimensionality reduction techniques are crucial for improving the efficiency and effectiveness of data mining tasks.

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    Description

    Test your knowledge of dimensionality reduction techniques in data mining with this quiz. Explore feature subset selection, feature creation, attribute transformation, discretization, binarization, and normalization methods. Learn about their applications and the Iris Plant data set example. Mastering these techniques is essential for enhancing the efficiency and effectiveness of data mining tasks.

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