DBST 667 – Data Mining
Dr. Irene Tsapara
Week 8 Individual Exercise
Deliverables: Two Files: (1) Submit this lab report with answers to all questions including output screenshots into the ‘Individual Exercises Week 8’ assignment folder. (2) Submit an R script that contains all commands with comments that briefly describe each commands purpose.
Grading: This exercise is worth 2% of the course grade. All questions must be answered in your own words with any paraphrased references properly cited using in-text citations and a reference list as needed. In addition, grammatical and spelling errors may affect the grade.
Part 2 – Run an exercise on the Vehicle Solhouettes dataset from vehicle.csv, completing this report and providing the commands, output screenshots, and discussion/interpretation as requested. Ensure that all commands are saved in this report AND in an R script.
For Reference: UCI Machine Learning Repository: Vehicle Silhouettes
Why do we need to remove the class variable as part of the data preprocessing steps for k-means clustering?
Why must we scale data as part of the data preprocessing steps for k-means clustering?
How many instances are in each cluster?
What information does the cluster means section provide and how were those numbers obtained?
What is the clustering vector?
What is the sum of squares by clusters and what does it mean?
What is the dominant vehicle class in each cluster?
What is the dominant cluster for each vehicle class?
What percentage of vehicles were clustered in agreement with the actual class?
(Hint: Your interpretation should discuss all of the visualized clusters and should begin to address specific observations (data points) within each that warrant discussion.)
|k=||Number of Instances in Each Cluster||Between Clusters Sum of Squares||Within Clusters Sum of Squares||Number of Iterations|
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