What’s the difference between a “training set” and a “test set”?
Why might a pruned decision tree that doesn’t fit the data so well be better than an un-pruned one?
What’s the first thing that 1R does when making a rule based on a numeric attribute?
How does 1R avoid overfitting when making a rule based on an enumerated and/or numeric attribute?
What is the difference between Attribute, Instance and Training set?
| OneR | – weka.classifiers.OneR |
| Decision table | – weka.classifiers.DecisionTable -R |
| C4.5 | – weka.classifiers.j48.J48 |
Do the decisions made by the classifiers make sense to you? Why?
What can you say about the accuracy of these classifiers? When classifying iris that has not been used for training?
How did each one of the methods perform?
| Decision Tree | – weka.classifiers.j48.J48 |
| Decision table | – weka.classifiers.DecisionTable -R |
| Linear regression | – weka.classifiers.LinearRegression |
| M5′ | – weka.classifiers.M5′ |
The dataset describes the time needed by a machine to produce and count 20 bolts. (More details can be found in the file containing the dataset.)
Analyze the data. What adjustments have the greatest effect on the time to count 20 bolts?
According to each classifier, how would you adjust the machine to get the shortest time to count 20 bolts?
| OneR | – weka.classifiers.OneR |
| Decision table | – weka.classifiers.DecisionTable -R |
| C4.5 | – weka.classifiers.j48.J48 |
| K-means | – weka.clusterers.SimpleKMeans |
Try using reduced error pruning for the C4.5. Did it change the produced model? Why?
For K-means, for the first run, set k=10. Adjust as needed. What was the final number of k? Why?
| Linear regression | – weka.classifiers.LinearRegression |
| M5′ | – weka.classifiers.M5′ |
| Regression Tree | – weka.classifiers.M5′ |
| K-means clustering | – weka.clusterers.SimpleKMeans |
A) How many leaves did the Model tree produce? Regression Tree? What happens if you change the pruning factor?
How many clusters did you choose for the K-means method? Was that a good choice? Did you try a different value for k?
B) Now perform the same analysis on the bodyfat.arff data set.
Change the acuity and cutoff parameters in order to produce a model similar to the one obtained in the book. Use the classes to cluster evaluation – what does that tell you?
| Decision table | – weka.classifiers.DecisionTable -R |
| C4.5 | – weka.classifiers.j48.J48 |
| Id3 | – weka.clusterers.Id3 |
A)What does the training set evaluation score tell you?
B)What does the cross-validation score evaluate?
C) Which one of these models would you say is the best? Why?
| C4.5 | – weka.classifiers.j48.J48 |
| Decision List | – weka. classifiers.PART |
A)What is the most important descriptor (attribute) in wine.arff?
B)How well were these two schemas able to learn the patterns in the dataset? How would you quantify your answer?
C)Compare the training set and 10-fold cross-validations scores of the two schemas.
D)Would you trust these two models? Did they really learn what is important for proper classification of wine?
E)Which one would you trust more, even if just very slightly?
A)-E) Same as in 2.
F) Why could not we use 10-fold evaluation in this example?
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