Chapter 5 exercises
20. Consider the task of building a classifier from random data, where the attribute values are generated randomly irrespective of the class labels. Assume the data set contains records from two classes, “+” and “−.” Half of the data set is used for training while the remaining half is used for testing.
(a) Suppose there are an equal number of positive and negative records in the data and the decision tree classifier predicts every test record to be positive. What is the expected error rate of the classifier on the test data?
(b) Repeat the previous analysis assuming that the classifier predicts each test record to be positive class with probability 0.8 and negative class with probability 0.2.
(c) Suppose two-thirds of the data belong to the positive class and the remaining one-third belong to the negative class. What is the expected error of a classifier that predicts every test record to be positive?
(d) Repeat the previous analysis assuming that the classifier predicts each test record to be positive class with probability 2/3 and negative class with probability 1/3.
Chapter 6 exercises
5. Prove Equation 6.3 in the book. (Hint: First, count the number of ways to create itemset that forms the left hand side of the rule. Next, for each size k itemset selected for the left-hand side, count the number of ways to choose the remaining d − k items to form the right-hand side of the rule.)
17. Suppose we have market basket data consisting of 100 transactions and 20 items. If the support for item a is 25%, the support for item b is 90% and the support for itemset {a, b} is 20%. Let the support and confidence thresholds be 10% and 60%, respectively.
(a) Compute the confidence of the association rule {a} -> {b}. Is the rule interesting according to the confidence measure?
(b) Compute the interest measure for the association pattern {a, b}. Describe the nature of the relationship between item a and item b in terms of the interest measure.
(c) What conclusions can you draw from the results of parts (a) and (b)?
(d) NOT NEEDED FOR THE TEST
Chapter 7 exercises
5. For the data set with the attributes given below, describe how you would convert it into a binary transaction data set appropriate for association analysis. Specifically, indicate for each attribute in the original data set.
(a) How many binary attributes it would correspond to in the transaction data set,
(b) How the values of the original attribute would be mapped to values of the binary attributes, and
(c) If there is any hierarchical structure in the data values of an attribute that could be useful for grouping the data into fewer binary attributes. The following is a list of attributes for the data set along with their possible values. Assume that all attributes are collected on a per-student basis:
• Year : Freshman, Sophomore, Junior, Senior, Graduate: Masters, Graduate: PhD, Professional
• Zip code : zip code for the home address of a U.S. student, zip code for the local address of a non-U.S. student
• College : Agriculture, Architecture, Continuing Education, Education, Liberal Arts, Engineering, Natural Sciences, Business, Law, Medical, Dentistry, Pharmacy, Nursing, Veterinary Medicine
• On Campus : 1 if the student lives on campus, 0 otherwise
• Each of the following is a separate attribute that has a value of 1 if the person speaks the language and a value of 0, otherwise.
- Arabic
- Bengali
- Chinese Mandarin
- English
- Portuguese
- Russian
- Spanish
Chapter 8 exercises
1. Consider a data set consisting of 2^(20) data vectors, where each vector has 32 components and each component is a 4-byte value. Suppose that vector quantization is used for compression and that 2^(16) prototype vectors are used. How many bytes of storage does that data set take before and after compression and what is the compression ratio?
8. Consider the mean of a cluster of objects from a binary transaction data set. What are the minimum and maximum values of the components of the mean? What is the interpretation of components of the cluster mean? Which components most accurately characterize the objects in the cluster?
9. Give an example of a data set consisting of three natural clusters, for which (almost always) K-means would likely find the correct clusters, but bisecting K-means would not.
11. Total SSE is the sum of the SSE for each separate attribute. What does it mean if the SSE for one variable is low for all clusters? Low for just one cluster? High for all clusters? High for just one cluster? How could you use the per variable SSE information to improve your clustering?
13. The Voronoi diagram for a set of 1( points in the plane is a partition of all the points of the plane into K regions, such that every point (of the plane) is assigned to the closest point among the 1( specified points. (See Figure 8.38.) What is the relationship between Voronoi diagrams and K-means clusters? What do Voronoi diagrams tell us about the possible shapes of K-means clusters?
Answer the following question:
Which role do you feel is more important in the organization – being the data administrator or the database administrator? Explain the difference as well as explain your selection. Provide a business use case example that exemplifies this choice clearly.
Instructions
This is a required assignment, worth 15 points. The assignment must be submitted by the due date. Late assignment are not allowed.
You are required to submit a minimum of two postings. Points will be deducted for not fulfilling this minimum requirement.
Apply and use the basic citation styles of APA is required. Points are deducted per the rubric for this behavior.
Do not claim credit for the words, ideas, and concepts of others. Use in-text citation and list the reference of your supporting source following APA’s style and formatting. Points are deducted per the rubric for this behavior.
Do not copy and paste information or concepts from the Internet and claim that is your work. It will be considered Plagiarism and you will receive zero for your work. A second offense results in a zero for the course. A third is termination from the university.
In this week’s reading, the concept of 3-F Method is introduced. Discuss the purpose of this concept and how it is calculated. Also perform your own research/analysis using these factors and provide your assessment on whether the United States need to introduce top talents in the field of big data and cloud computing by using bibliometrics.
need all bst.java methods to be completed and working.
the instructions for the methods are in DefaultMap.java
no need to look into other 3 files, mainly for testing and compiling
do not change source code
Discuss the benefits of technology to support Access Control.
Length, 2 – 3 pages.
All paper are written in APA formatting, include title and references pages (not counted). Must use at least two references and citations.
Please reference the rubric for grading.
The app should be made using Xcode with swift Language. No other programming languages should be used just SWIFT.
Please following the requirement which is in the PDF file, and give the same output as the PDF file shows.
At UC, it is a priority that students are provided with strong educational programs and courses that allow them to be servant-leaders in their disciplines and communities, linking research with practice and knowledge with ethical decision-making. This assignment is a written assignment where students will demonstrate how this course research has connected and put into practice within their own career.
Assignment:
Provide a reflection of at least 500 words (or 2 pages double spaced) of how the knowledge, skills, or theories of this course have been applied, or could be applied, in a practical manner to your current work environment. If you are not currently working, share times when you have or could observe these theories and knowledge could be applied to an employment opportunity in your field of study.
Requirements: