Shiny practice items 'Statistics and business analytics', module 9

This app allows you to practice various aspects covered in this module.

Please make sure that you have fully completed the following tasks before continuing with this app:

1. Read the module's learning plan

2. Watch the topic videos and review the lecture notes

3. Work through the SPSS How to guide



The module has the following objectives:

1. Discuss the logic behind cluster analysis

2. Explain the K-means approach to clustering

3. Decide on the number of clusters underlying the data

4. Interpret clustering output for decision making

5. Perform a cluster analysis with R/Shiny



Please proceed with the practice items by clicking on the links in the top bar of this app. It is not necessary to complete these items in order. We encourage you to work together with a classmate!

There are three types of practice items: theory ('TH'), SPSS ('SP') and multiple choice ('MC').

These practice items will help you come prepared to the lab and help you perform better on the quizzes.

Thus, you should complete these practice items before joining the lab meeting corresponding to this module.

MBA program
Peter Ebbes

Topic

Interpreting K-means output


Lecture

topic 2, K-means clustering

topic 3, Mini-case clustering solution and findings


Purpose

Practice interpreting K-means output including fit-statistics from cross validation. Let's do it!


Question 1

Before you get started with any fancy-pancy data analytic approach, it is always a good idea to imagine how the data table could look like. Write down on scratch paper, how the data table could look like for this context.



Question 2



Question 3


Topic

How many clusters?


Lecture

topic 2, K-means clustering

This activity is only useful if you have reviewed the corresponding SPSS How to guide.


Purpose

Practice identifying how many cluster underlay the data and giving the cluster solution an interpretation. Let's do it!

Scenario



Question 1



Question 2



Question 3



Topic

Five multiple choice practice questions


Lecture

Module 9, all topics


Purpose

Test your knowledge about the subjects of this module. Let's do it!

1. A researcher fits a regression with a large set of independent variables. He celebrates because the R-square is 98%. Yet, a few months later, the researcher is dissapointed as the model did not work at all to predict for new observations. He had checked the VIFs (all close to 1) and he was not extrapolating the data. What may be going on?


2. A financial analyst is running cluster analysis on a large set of stock returns. Which of the following expressions is not true?


3. Which of the following expressions about cluster analysis is not true?


4. K-means clustering...


5. Cross-validation...